diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
index 40fd3126..4a774dbd 100644
--- a/.github/workflows/clang-format.yml
+++ b/.github/workflows/clang-format.yml
@@ -16,4 +16,5 @@ jobs:
         with:
           source: "."
           extensions: "hpp,h,cpp,c"
-          clangFormatVersion: 16
+          style: "file:.clang-format"
+          clangFormatVersion: 18
diff --git a/README.md b/README.md
index a019eb6f..55a6c7d9 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@
 - Sway (Workspaces, Binding mode, Focused window name)
 - River (Mapping mode, Tags, Focused window name)
 - Hyprland (Window Icons, Workspaces, Focused window name)
+- Niri (Workspaces, Focused window name, Language)
 - DWL (Tags, Focused window name) [requires dwl ipc patch](https://github.com/djpohly/dwl/wiki/ipc)
 - Tray [#21](https://github.com/Alexays/Waybar/issues/21)
 - Local time
diff --git a/flake.lock b/flake.lock
index b8f68f4b..9bd73acc 100644
--- a/flake.lock
+++ b/flake.lock
@@ -18,11 +18,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1722185531,
-        "narHash": "sha256-veKR07psFoJjINLC8RK4DiLniGGMgF3QMlS4tb74S6k=",
+        "lastModified": 1724819573,
+        "narHash": "sha256-GnR7/ibgIH1vhoy8cYdmXE6iyZqKqFxQSVkFgosBh6w=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "52ec9ac3b12395ad677e8b62106f0b98c1f8569d",
+        "rev": "71e91c409d1e654808b2621f28a327acfdad8dc2",
         "type": "github"
       },
       "original": {
diff --git a/include/AModule.hpp b/include/AModule.hpp
index facb3130..94a88371 100644
--- a/include/AModule.hpp
+++ b/include/AModule.hpp
@@ -16,7 +16,7 @@ class AModule : public IModule {
 
   ~AModule() override;
   auto update() -> void override;
-  virtual auto refresh(int shouldRefresh) -> void{};
+  virtual auto refresh(int shouldRefresh) -> void {};
   operator Gtk::Widget &() override;
   auto doAction(const std::string &name) -> void override;
 
diff --git a/include/modules/clock.hpp b/include/modules/clock.hpp
index c212ec8b..0c62b676 100644
--- a/include/modules/clock.hpp
+++ b/include/modules/clock.hpp
@@ -51,8 +51,8 @@ class Clock final : public ALabel {
   day cldBaseDay_{0};            // calendar Cached day. Is used when today is changing(midnight)
   std::string cldText_{""};      // calendar text to print
   CldMode cldMode_{CldMode::MONTH};
-  auto get_calendar(const year_month_day& today, const year_month_day& ymd, const time_zone* tz)
-      -> const std::string;
+  auto get_calendar(const year_month_day& today, const year_month_day& ymd,
+                    const time_zone* tz) -> const std::string;
 
   // get local time zone
   auto local_zone() -> const time_zone*;
diff --git a/include/modules/hyprland/workspaces.hpp b/include/modules/hyprland/workspaces.hpp
index f5c20f69..a9d56b79 100644
--- a/include/modules/hyprland/workspaces.hpp
+++ b/include/modules/hyprland/workspaces.hpp
@@ -61,8 +61,8 @@ class Workspaces : public AModule, public EventHandler {
   // Config
   void parseConfig(const Json::Value& config);
   auto populateIconsMap(const Json::Value& formatIcons) -> void;
-  static auto populateBoolConfig(const Json::Value& config, const std::string& key, bool& member)
-      -> void;
+  static auto populateBoolConfig(const Json::Value& config, const std::string& key,
+                                 bool& member) -> void;
   auto populateSortByConfig(const Json::Value& config) -> void;
   auto populateIgnoreWorkspacesConfig(const Json::Value& config) -> void;
   auto populateFormatWindowSeparatorConfig(const Json::Value& config) -> void;
diff --git a/include/modules/niri/backend.hpp b/include/modules/niri/backend.hpp
new file mode 100644
index 00000000..42b9ff7f
--- /dev/null
+++ b/include/modules/niri/backend.hpp
@@ -0,0 +1,52 @@
+#pragma once
+
+#include <list>
+#include <mutex>
+#include <string>
+#include <utility>
+
+#include "util/json.hpp"
+
+namespace waybar::modules::niri {
+
+class EventHandler {
+ public:
+  virtual void onEvent(const Json::Value& ev) = 0;
+  virtual ~EventHandler() = default;
+};
+
+class IPC {
+ public:
+  IPC() { startIPC(); }
+
+  void registerForIPC(const std::string& ev, EventHandler* ev_handler);
+  void unregisterForIPC(EventHandler* handler);
+
+  static Json::Value send(const Json::Value& request);
+
+  // The data members are only safe to access while dataMutex_ is locked.
+  std::lock_guard<std::mutex> lockData() { return std::lock_guard(dataMutex_); }
+  const std::vector<Json::Value>& workspaces() const { return workspaces_; }
+  const std::vector<Json::Value>& windows() const { return windows_; }
+  const std::vector<std::string>& keyboardLayoutNames() const { return keyboardLayoutNames_; }
+  unsigned keyboardLayoutCurrent() const { return keyboardLayoutCurrent_; }
+
+ private:
+  void startIPC();
+  static int connectToSocket();
+  void parseIPC(const std::string&);
+
+  std::mutex dataMutex_;
+  std::vector<Json::Value> workspaces_;
+  std::vector<Json::Value> windows_;
+  std::vector<std::string> keyboardLayoutNames_;
+  unsigned keyboardLayoutCurrent_;
+
+  util::JsonParser parser_;
+  std::mutex callbackMutex_;
+  std::list<std::pair<std::string, EventHandler*>> callbacks_;
+};
+
+inline std::unique_ptr<IPC> gIPC;
+
+};  // namespace waybar::modules::niri
diff --git a/include/modules/niri/language.hpp b/include/modules/niri/language.hpp
new file mode 100644
index 00000000..42b90ac4
--- /dev/null
+++ b/include/modules/niri/language.hpp
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <string>
+
+#include "ALabel.hpp"
+#include "bar.hpp"
+#include "modules/niri/backend.hpp"
+
+namespace waybar::modules::niri {
+
+class Language : public ALabel, public EventHandler {
+ public:
+  Language(const std::string &, const Bar &, const Json::Value &);
+  ~Language() override;
+  void update() override;
+
+ private:
+  void updateFromIPC();
+  void onEvent(const Json::Value &ev) override;
+  void doUpdate();
+
+  struct Layout {
+    std::string full_name;
+    std::string short_name;
+    std::string variant;
+    std::string short_description;
+  };
+
+  static Layout getLayout(const std::string &fullName);
+
+  std::mutex mutex_;
+  const Bar &bar_;
+
+  std::vector<Layout> layouts_;
+  unsigned current_idx_;
+};
+
+}  // namespace waybar::modules::niri
diff --git a/include/modules/niri/window.hpp b/include/modules/niri/window.hpp
new file mode 100644
index 00000000..909ae6f0
--- /dev/null
+++ b/include/modules/niri/window.hpp
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <gtkmm/button.h>
+#include <json/value.h>
+
+#include "AAppIconLabel.hpp"
+#include "bar.hpp"
+#include "modules/niri/backend.hpp"
+
+namespace waybar::modules::niri {
+
+class Window : public AAppIconLabel, public EventHandler {
+ public:
+  Window(const std::string &, const Bar &, const Json::Value &);
+  ~Window() override;
+  void update() override;
+
+ private:
+  void onEvent(const Json::Value &ev) override;
+  void doUpdate();
+  void setClass(const std::string &className, bool enable);
+
+  const Bar &bar_;
+
+  std::string oldAppId_;
+};
+
+}  // namespace waybar::modules::niri
diff --git a/include/modules/niri/workspaces.hpp b/include/modules/niri/workspaces.hpp
new file mode 100644
index 00000000..a6850ed1
--- /dev/null
+++ b/include/modules/niri/workspaces.hpp
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <gtkmm/button.h>
+#include <json/value.h>
+
+#include "AModule.hpp"
+#include "bar.hpp"
+#include "modules/niri/backend.hpp"
+
+namespace waybar::modules::niri {
+
+class Workspaces : public AModule, public EventHandler {
+ public:
+  Workspaces(const std::string &, const Bar &, const Json::Value &);
+  ~Workspaces() override;
+  void update() override;
+
+ private:
+  void onEvent(const Json::Value &ev) override;
+  void doUpdate();
+  Gtk::Button &addButton(const Json::Value &ws);
+  std::string getIcon(const std::string &value, const Json::Value &ws);
+
+  const Bar &bar_;
+  Gtk::Box box_;
+  // Map from niri workspace id to button.
+  std::unordered_map<uint64_t, Gtk::Button> buttons_;
+};
+
+}  // namespace waybar::modules::niri
diff --git a/include/util/clara.hpp b/include/util/clara.hpp
index 73fa5415..da7151fe 100644
--- a/include/util/clara.hpp
+++ b/include/util/clara.hpp
@@ -622,8 +622,8 @@ inline auto convertInto(std::string const &source, bool &target) -> ParserResult
 }
 #ifdef CLARA_CONFIG_OPTIONAL_TYPE
 template <typename T>
-inline auto convertInto(std::string const &source, CLARA_CONFIG_OPTIONAL_TYPE<T> &target)
-    -> ParserResult {
+inline auto convertInto(std::string const &source,
+                        CLARA_CONFIG_OPTIONAL_TYPE<T> &target) -> ParserResult {
   T temp;
   auto result = convertInto(source, temp);
   if (result) target = std::move(temp);
@@ -751,8 +751,8 @@ class ParserBase {
  public:
   virtual ~ParserBase() = default;
   virtual auto validate() const -> Result { return Result::ok(); }
-  virtual auto parse(std::string const &exeName, TokenStream const &tokens) const
-      -> InternalParseResult = 0;
+  virtual auto parse(std::string const &exeName,
+                     TokenStream const &tokens) const -> InternalParseResult = 0;
   virtual auto cardinality() const -> size_t { return 1; }
 
   auto parse(Args const &args) const -> InternalParseResult {
@@ -1098,8 +1098,8 @@ struct Parser : ParserBase {
 
   using ParserBase::parse;
 
-  auto parse(std::string const &exeName, TokenStream const &tokens) const
-      -> InternalParseResult override {
+  auto parse(std::string const &exeName,
+             TokenStream const &tokens) const -> InternalParseResult override {
     struct ParserInfo {
       ParserBase const *parser = nullptr;
       size_t count = 0;
diff --git a/include/util/format.hpp b/include/util/format.hpp
index cf8d706b..c8ed837a 100644
--- a/include/util/format.hpp
+++ b/include/util/format.hpp
@@ -6,7 +6,7 @@
 class pow_format {
  public:
   pow_format(long long val, std::string&& unit, bool binary = false)
-      : val_(val), unit_(unit), binary_(binary){};
+      : val_(val), unit_(unit), binary_(binary) {};
 
   long long val_;
   std::string unit_;
diff --git a/man/waybar-backlight.5.scd b/man/waybar-backlight.5.scd
index 1f674fc0..5286c2ed 100644
--- a/man/waybar-backlight.5.scd
+++ b/man/waybar-backlight.5.scd
@@ -38,7 +38,7 @@ The *backlight* module displays the current backlight level.
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *states*: ++
 	typeof: object ++
diff --git a/man/waybar-battery.5.scd b/man/waybar-battery.5.scd
index 4fe9650a..29cb7d6d 100644
--- a/man/waybar-battery.5.scd
+++ b/man/waybar-battery.5.scd
@@ -69,7 +69,7 @@ The *battery* module displays the current capacity and state (eg. charging) of y
 
 *rotate*: ++
 	typeof: integer++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *on-click*: ++
 	typeof: string ++
diff --git a/man/waybar-bluetooth.5.scd b/man/waybar-bluetooth.5.scd
index 1783dab3..bd64f457 100644
--- a/man/waybar-bluetooth.5.scd
+++ b/man/waybar-bluetooth.5.scd
@@ -54,7 +54,7 @@ Addressed by *bluetooth*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-clock.5.scd b/man/waybar-clock.5.scd
index 40aedd15..3947266d 100644
--- a/man/waybar-clock.5.scd
+++ b/man/waybar-clock.5.scd
@@ -51,7 +51,7 @@ $XDG_CONFIG_HOME/waybar/config ++
 |[ *rotate*
 :[ integer
 :[
-:[ Positive value to rotate the text label
+:[ Positive value to rotate the text label (in 90 degree increments)
 |[ *on-click*
 :[ string
 :[
diff --git a/man/waybar-cpu.5.scd b/man/waybar-cpu.5.scd
index fcbd1265..6b13a563 100644
--- a/man/waybar-cpu.5.scd
+++ b/man/waybar-cpu.5.scd
@@ -43,7 +43,7 @@ The *cpu* module displays the current CPU utilization.
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *states*: ++
 	typeof: object ++
diff --git a/man/waybar-custom.5.scd b/man/waybar-custom.5.scd
index 4cf3c33d..aba1c18f 100644
--- a/man/waybar-custom.5.scd
+++ b/man/waybar-custom.5.scd
@@ -64,7 +64,7 @@ Addressed by *custom/<name>*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-disk.5.scd b/man/waybar-disk.5.scd
index df9ca4e5..1699a511 100644
--- a/man/waybar-disk.5.scd
+++ b/man/waybar-disk.5.scd
@@ -29,7 +29,7 @@ Addressed by *disk*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *states*: ++
 	typeof: object ++
diff --git a/man/waybar-dwl-window.5.scd b/man/waybar-dwl-window.5.scd
index c2f5b93e..f185c82c 100644
--- a/man/waybar-dwl-window.5.scd
+++ b/man/waybar-dwl-window.5.scd
@@ -19,7 +19,7 @@ Addressed by *dwl/window*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-hyprland-submap.5.scd b/man/waybar-hyprland-submap.5.scd
index 64398e61..e27138e7 100644
--- a/man/waybar-hyprland-submap.5.scd
+++ b/man/waybar-hyprland-submap.5.scd
@@ -19,7 +19,7 @@ Addressed by *hyprland/submap*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-idle-inhibitor.5.scd b/man/waybar-idle-inhibitor.5.scd
index f7677634..81a097a7 100644
--- a/man/waybar-idle-inhibitor.5.scd
+++ b/man/waybar-idle-inhibitor.5.scd
@@ -21,7 +21,7 @@ screensaver, also known as "presentation mode".
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-inhibitor.5.scd b/man/waybar-inhibitor.5.scd
index 679a5c4b..5513cc49 100644
--- a/man/waybar-inhibitor.5.scd
+++ b/man/waybar-inhibitor.5.scd
@@ -25,7 +25,7 @@ See *systemd-inhibit*(1) for more information.
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-jack.5.scd b/man/waybar-jack.5.scd
index 573b36c2..180143b7 100644
--- a/man/waybar-jack.5.scd
+++ b/man/waybar-jack.5.scd
@@ -51,7 +51,7 @@ Addressed by *jack*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-memory.5.scd b/man/waybar-memory.5.scd
index 7738c576..5c368ae8 100644
--- a/man/waybar-memory.5.scd
+++ b/man/waybar-memory.5.scd
@@ -29,7 +29,7 @@ Addressed by *memory*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *states*: ++
 	typeof: object ++
diff --git a/man/waybar-mpd.5.scd b/man/waybar-mpd.5.scd
index 2f1bdf20..c576a5c0 100644
--- a/man/waybar-mpd.5.scd
+++ b/man/waybar-mpd.5.scd
@@ -91,7 +91,7 @@ Addressed by *mpd*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-mpris.5.scd b/man/waybar-mpris.5.scd
index 455fcb17..380a1a19 100644
--- a/man/waybar-mpris.5.scd
+++ b/man/waybar-mpris.5.scd
@@ -107,7 +107,7 @@ The *mpris* module displays currently playing media via libplayerctl.
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-network.5.scd b/man/waybar-network.5.scd
index bd546916..e1cf810d 100644
--- a/man/waybar-network.5.scd
+++ b/man/waybar-network.5.scd
@@ -58,7 +58,7 @@ Addressed by *network*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-niri-language.5.scd b/man/waybar-niri-language.5.scd
new file mode 100644
index 00000000..6895d25c
--- /dev/null
+++ b/man/waybar-niri-language.5.scd
@@ -0,0 +1,58 @@
+waybar-niri-language(5)
+
+# NAME
+
+waybar - niri language module
+
+# DESCRIPTION
+
+The *language* module displays the currently selected language in niri.
+
+# CONFIGURATION
+
+Addressed by *niri/language*
+
+*format*: ++
+	typeof: string ++
+	default: {} ++
+	The format, how information should be displayed.
+
+*format-<lang>* ++
+	typeof: string++
+	Provide an alternative name to display per language where <lang> is the language of your choosing. Can be passed multiple times with multiple languages as shown by the example below.
+
+*menu*: ++
+	typeof: string ++
+	Action that popups the menu.
+
+*menu-file*: ++
+	typeof: string ++
+	Location of the menu descriptor file. There need to be an element of type GtkMenu with id *menu*
+
+*menu-actions*: ++
+	typeof: array ++
+	The actions corresponding to the buttons of the menu.
+
+# FORMAT REPLACEMENTS
+
+*{short}*: Short name of layout (e.g. "us"). Equals to {}.
+
+*{shortDescription}*: Short description of layout (e.g. "en").
+
+*{long}*: Long name of layout (e.g. "English (Dvorak)").
+
+*{variant}*: Variant of layout (e.g. "dvorak").
+
+# EXAMPLES
+
+```
+"niri/language": {
+	"format": "Lang: {long}"
+	"format-en": "AMERICA, HELL YEAH!"
+	"format-tr": "As bayrakları"
+}
+```
+
+# STYLE
+
+- *#language*
diff --git a/man/waybar-niri-window.5.scd b/man/waybar-niri-window.5.scd
new file mode 100644
index 00000000..9e2e9f63
--- /dev/null
+++ b/man/waybar-niri-window.5.scd
@@ -0,0 +1,81 @@
+waybar-niri-window(5)
+
+# NAME
+
+waybar - niri window module
+
+# DESCRIPTION
+
+The *window* module displays the title of the currently focused window in niri.
+
+# CONFIGURATION
+
+Addressed by *niri/window*
+
+*format*: ++
+	typeof: string ++
+	default: {title} ++
+	The format, how information should be displayed. On {} the current window title is displayed.
+
+*rewrite*: ++
+	typeof: object ++
+	Rules to rewrite window title. See *rewrite rules*.
+
+*separate-outputs*: ++
+	typeof: bool ++
+	Show the active window of the monitor the bar belongs to, instead of the focused window.
+
+*icon*: ++
+	typeof: bool ++
+	default: false ++
+	Option to hide the application icon.
+
+*icon-size*: ++
+	typeof: integer ++
+	default: 24 ++
+	Option to change the size of the application icon.
+
+# FORMAT REPLACEMENTS
+
+See the output of "niri msg windows" for examples
+
+*{title}*: The current title of the focused window.
+
+*{app_id}*: The current app ID of the focused window.
+
+# REWRITE RULES
+
+*rewrite* is an object where keys are regular expressions and values are
+rewrite rules if the expression matches. Rules may contain references to
+captures of the expression.
+
+Regular expression and replacement follow ECMA-script rules.
+
+If no expression matches, the title is left unchanged.
+
+Invalid expressions (e.g., mismatched parentheses) are skipped.
+
+# EXAMPLES
+
+```
+"niri/window": {
+	"format": "{}",
+	"rewrite": {
+		"(.*) - Mozilla Firefox": "🌎 $1",
+		"(.*) - zsh": "> [$1]"
+	}
+}
+```
+
+# STYLE
+
+- *#window*
+- *window#waybar.empty #window* When no windows are on the workspace
+
+The following classes are applied to the entire Waybar rather than just the
+window widget:
+
+- *window#waybar.empty* When no windows are in the workspace
+- *window#waybar.solo* When only one window is on the workspace
+- *window#waybar.<app-id>* Where *app-id* is the app ID of the only window on
+  the workspace
diff --git a/man/waybar-niri-workspaces.5.scd b/man/waybar-niri-workspaces.5.scd
new file mode 100644
index 00000000..50e497cd
--- /dev/null
+++ b/man/waybar-niri-workspaces.5.scd
@@ -0,0 +1,97 @@
+waybar-niri-workspaces(5)
+
+# NAME
+
+waybar - niri workspaces module
+
+# DESCRIPTION
+
+The *workspaces* module displays the currently used workspaces in niri.
+
+# CONFIGURATION
+
+Addressed by *niri/workspaces*
+
+*all-outputs*: ++
+	typeof: bool ++
+	default: false ++
+	If set to false, workspaces will only be shown on the output they are on. If set to true all workspaces will be shown on every output.
+
+*format*: ++
+	typeof: string ++
+	default: {value} ++
+	The format, how information should be displayed.
+
+*format-icons*: ++
+	typeof: array ++
+	Based on the workspace name, index and state, the corresponding icon gets selected. See *icons*.
+
+*disable-click*: ++
+	typeof: bool ++
+	default: false ++
+	If set to false, you can click to change workspace. If set to true this behaviour is disabled.
+
+*disable-markup*: ++
+	typeof: bool ++
+	default: false ++
+	If set to true, button label will escape pango markup.
+
+*current-only*: ++
+	typeof: bool ++
+	default: false ++
+	If set to true, only the active or focused workspace will be shown.
+
+*on-update*: ++
+	typeof: string ++
+	Command to execute when the module is updated.
+
+# FORMAT REPLACEMENTS
+
+*{value}*: Name of the workspace, or index for unnamed workspaces,
+as defined by niri.
+
+*{name}*: Name of the workspace for named workspaces.
+
+*{icon}*: Icon, as defined in *format-icons*.
+
+*{index}*: Index of the workspace on its output.
+
+*{output}*: Output where the workspace is located.
+
+# ICONS
+
+Additional to workspace name matching, the following *format-icons* can be set.
+
+- *default*: Will be shown, when no string matches are found.
+- *focused*: Will be shown, when workspace is focused.
+- *active*: Will be shown, when workspace is active on its output.
+
+# EXAMPLES
+
+```
+"niri/workspaces": {
+	"format": "{icon}",
+	"format-icons": {
+		// Named workspaces
+		// (you need to configure them in niri)
+		"browser": "",
+		"discord": "",
+		"chat": "<b></b>",
+
+		// Icons by state
+		"active": "",
+		"default": ""
+	}
+}
+```
+
+# Style
+
+- *#workspaces button*
+- *#workspaces button.focused*: The single focused workspace.
+- *#workspaces button.active*: The workspace is active (visible) on its output.
+- *#workspaces button.empty*: The workspace is empty.
+- *#workspaces button.current_output*: The workspace is from the same output as
+  the bar that it is displayed on.
+- *#workspaces button#niri-workspace-<name>*: Workspaces named this, or index
+  for unnamed workspaces.
diff --git a/man/waybar-pulseaudio.5.scd b/man/waybar-pulseaudio.5.scd
index 232e84a0..5b38e8b7 100644
--- a/man/waybar-pulseaudio.5.scd
+++ b/man/waybar-pulseaudio.5.scd
@@ -40,7 +40,7 @@ Additionally, you can control the volume by scrolling *up* or *down* while the c
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *states*: ++
 	typeof: object ++
diff --git a/man/waybar-river-layout.5.scd b/man/waybar-river-layout.5.scd
index 4fb23085..1368bda9 100644
--- a/man/waybar-river-layout.5.scd
+++ b/man/waybar-river-layout.5.scd
@@ -21,7 +21,7 @@ Addressed by *river/layout*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-river-mode.5.scd b/man/waybar-river-mode.5.scd
index 5769a9a2..b992fdaf 100644
--- a/man/waybar-river-mode.5.scd
+++ b/man/waybar-river-mode.5.scd
@@ -19,7 +19,7 @@ Addressed by *river/mode*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-river-window.5.scd b/man/waybar-river-window.5.scd
index 7e661f43..6db9a2fa 100644
--- a/man/waybar-river-window.5.scd
+++ b/man/waybar-river-window.5.scd
@@ -19,7 +19,7 @@ Addressed by *river/window*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-sndio.5.scd b/man/waybar-sndio.5.scd
index f8d1615d..03dfe0af 100644
--- a/man/waybar-sndio.5.scd
+++ b/man/waybar-sndio.5.scd
@@ -20,7 +20,7 @@ cursor is over the module, and clicking on the module toggles mute.
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-sway-mode.5.scd b/man/waybar-sway-mode.5.scd
index 1fcf3cf8..8d5d7c2c 100644
--- a/man/waybar-sway-mode.5.scd
+++ b/man/waybar-sway-mode.5.scd
@@ -19,7 +19,7 @@ Addressed by *sway/mode*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-sway-window.5.scd b/man/waybar-sway-window.5.scd
index 037e6b55..6d1e3196 100644
--- a/man/waybar-sway-window.5.scd
+++ b/man/waybar-sway-window.5.scd
@@ -19,7 +19,7 @@ Addressed by *sway/window*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-temperature.5.scd b/man/waybar-temperature.5.scd
index eab4cbb3..541bf3af 100644
--- a/man/waybar-temperature.5.scd
+++ b/man/waybar-temperature.5.scd
@@ -60,7 +60,7 @@ Addressed by *temperature*
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *max-length*: ++
 	typeof: integer ++
diff --git a/man/waybar-wireplumber.5.scd b/man/waybar-wireplumber.5.scd
index 770ff0d5..9c26ebaf 100644
--- a/man/waybar-wireplumber.5.scd
+++ b/man/waybar-wireplumber.5.scd
@@ -31,7 +31,7 @@ The *wireplumber* module displays the current volume reported by WirePlumber.
 
 *rotate*: ++
 	typeof: integer ++
-	Positive value to rotate the text label.
+	Positive value to rotate the text label (in 90 degree increments).
 
 *states*: ++
 	typeof: object ++
diff --git a/man/waybar.5.scd.in b/man/waybar.5.scd.in
index db546e17..f3a89656 100644
--- a/man/waybar.5.scd.in
+++ b/man/waybar.5.scd.in
@@ -323,6 +323,9 @@ A group may hide all but one element, showing them only on mouse hover. In order
 - *waybar-hyprland-submap(5)*
 - *waybar-hyprland-window(5)*
 - *waybar-hyprland-workspaces(5)*
+- *waybar-niri-language(5)*
+- *waybar-niri-window(5)*
+- *waybar-niri-workspaces(5)*
 - *waybar-idle-inhibitor(5)*
 - *waybar-image(5)*
 - *waybar-inhibitor(5)*
diff --git a/meson.build b/meson.build
index 8daa6c9c..42f9da92 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project(
     'waybar', 'cpp', 'c',
-    version: '0.10.4',
+    version: '0.11.0',
     license: 'MIT',
     meson_version: '>= 0.59.0',
     default_options : [
@@ -69,7 +69,7 @@ is_openbsd = host_machine.system() == 'openbsd'
 
 thread_dep = dependency('threads')
 fmt = dependency('fmt', version : ['>=8.1.1'], fallback : ['fmt', 'fmt_dep'])
-spdlog = dependency('spdlog', version : ['>=1.10.0'], fallback : ['spdlog', 'spdlog_dep'], default_options : ['external_fmt=enabled'])
+spdlog = dependency('spdlog', version : ['>=1.10.0'], fallback : ['spdlog', 'spdlog_dep'], default_options : ['external_fmt=enabled', 'std_format=disabled', 'tests=disabled'])
 wayland_client = dependency('wayland-client')
 wayland_cursor = dependency('wayland-cursor')
 wayland_protos = dependency('wayland-protocols')
@@ -318,6 +318,21 @@ if true
     )
 endif
 
+if get_option('niri')
+    add_project_arguments('-DHAVE_NIRI', language: 'cpp')
+    src_files += files(
+        'src/modules/niri/backend.cpp',
+        'src/modules/niri/language.cpp',
+        'src/modules/niri/window.cpp',
+        'src/modules/niri/workspaces.cpp',
+    )
+    man_files += files(
+        'man/waybar-niri-language.5.scd',
+        'man/waybar-niri-window.5.scd',
+        'man/waybar-niri-workspaces.5.scd',
+    )
+endif
+
 if libnl.found() and libnlgen.found()
     add_project_arguments('-DHAVE_LIBNL', language: 'cpp')
     src_files += files('src/modules/network.cpp')
diff --git a/meson_options.txt b/meson_options.txt
index fef50839..303ef038 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -19,3 +19,4 @@ option('experimental', type : 'boolean', value : false, description: 'Enable exp
 option('jack', type: 'feature', value: 'auto', description: 'Enable support for JACK')
 option('wireplumber', type: 'feature', value: 'auto', description: 'Enable support for WirePlumber')
 option('cava', type: 'feature', value: 'auto', description: 'Enable support for Cava')
+option('niri', type: 'boolean', description: 'Enable support for niri')
diff --git a/src/ALabel.cpp b/src/ALabel.cpp
index ecb1b7ce..467572f1 100644
--- a/src/ALabel.cpp
+++ b/src/ALabel.cpp
@@ -45,6 +45,8 @@ ALabel::ALabel(const Json::Value& config, const std::string& name, const std::st
 
   if (config_["rotate"].isUInt()) {
     rotate = config["rotate"].asUInt();
+    if (not(rotate == 0 || rotate == 90 || rotate == 180 || rotate == 270))
+      spdlog::warn("'rotate' is only supported in 90 degree increments {} is not valid.", rotate);
     label_.set_angle(rotate);
   }
 
diff --git a/src/factory.cpp b/src/factory.cpp
index ca10ef95..6c2313e3 100644
--- a/src/factory.cpp
+++ b/src/factory.cpp
@@ -36,6 +36,11 @@
 #include "modules/hyprland/window.hpp"
 #include "modules/hyprland/workspaces.hpp"
 #endif
+#ifdef HAVE_NIRI
+#include "modules/niri/language.hpp"
+#include "modules/niri/window.hpp"
+#include "modules/niri/workspaces.hpp"
+#endif
 #if defined(__FreeBSD__) || defined(__linux__)
 #include "modules/battery.hpp"
 #endif
@@ -205,6 +210,17 @@ waybar::AModule* waybar::Factory::makeModule(const std::string& name,
     if (ref == "hyprland/workspaces") {
       return new waybar::modules::hyprland::Workspaces(id, bar_, config_[name]);
     }
+#endif
+#ifdef HAVE_NIRI
+    if (ref == "niri/language") {
+      return new waybar::modules::niri::Language(id, bar_, config_[name]);
+    }
+    if (ref == "niri/window") {
+      return new waybar::modules::niri::Window(id, bar_, config_[name]);
+    }
+    if (ref == "niri/workspaces") {
+      return new waybar::modules::niri::Workspaces(id, bar_, config_[name]);
+    }
 #endif
     if (ref == "idle_inhibitor") {
       return new waybar::modules::IdleInhibitor(id, bar_, config_[name]);
diff --git a/src/modules/bluetooth.cpp b/src/modules/bluetooth.cpp
index 06475a2e..c8f1f996 100644
--- a/src/modules/bluetooth.cpp
+++ b/src/modules/bluetooth.cpp
@@ -49,8 +49,8 @@ auto getBoolProperty(GDBusProxy* proxy, const char* property_name) -> bool {
   return false;
 }
 
-auto getOptionalStringProperty(GDBusProxy* proxy, const char* property_name)
-    -> std::optional<std::string> {
+auto getOptionalStringProperty(GDBusProxy* proxy,
+                               const char* property_name) -> std::optional<std::string> {
   auto gvar = g_dbus_proxy_get_cached_property(proxy, property_name);
   if (gvar) {
     std::string property_value = g_variant_get_string(gvar, NULL);
@@ -345,8 +345,8 @@ auto waybar::modules::Bluetooth::onInterfaceAddedOrRemoved(GDBusObjectManager* m
 
 auto waybar::modules::Bluetooth::onInterfaceProxyPropertiesChanged(
     GDBusObjectManagerClient* manager, GDBusObjectProxy* object_proxy, GDBusProxy* interface_proxy,
-    GVariant* changed_properties, const gchar* const* invalidated_properties, gpointer user_data)
-    -> void {
+    GVariant* changed_properties, const gchar* const* invalidated_properties,
+    gpointer user_data) -> void {
   std::string interface_name = g_dbus_proxy_get_interface_name(interface_proxy);
   std::string object_path = g_dbus_object_get_object_path(G_DBUS_OBJECT(object_proxy));
 
@@ -395,8 +395,8 @@ auto waybar::modules::Bluetooth::getDeviceBatteryPercentage(GDBusObject* object)
   return std::nullopt;
 }
 
-auto waybar::modules::Bluetooth::getDeviceProperties(GDBusObject* object, DeviceInfo& device_info)
-    -> bool {
+auto waybar::modules::Bluetooth::getDeviceProperties(GDBusObject* object,
+                                                     DeviceInfo& device_info) -> bool {
   GDBusProxy* proxy_device = G_DBUS_PROXY(g_dbus_object_get_interface(object, "org.bluez.Device1"));
 
   if (proxy_device != NULL) {
@@ -462,9 +462,8 @@ auto waybar::modules::Bluetooth::findCurController() -> std::optional<Controller
   return controller_info;
 }
 
-auto waybar::modules::Bluetooth::findConnectedDevices(const std::string& cur_controller_path,
-                                                      std::vector<DeviceInfo>& connected_devices)
-    -> void {
+auto waybar::modules::Bluetooth::findConnectedDevices(
+    const std::string& cur_controller_path, std::vector<DeviceInfo>& connected_devices) -> void {
   GList* objects = g_dbus_object_manager_get_objects(manager_.get());
   for (GList* l = objects; l != NULL; l = l->next) {
     GDBusObject* object = G_DBUS_OBJECT(l->data);
diff --git a/src/modules/clock.cpp b/src/modules/clock.cpp
index 7a4cb9c2..db2979eb 100644
--- a/src/modules/clock.cpp
+++ b/src/modules/clock.cpp
@@ -198,8 +198,8 @@ const unsigned cldRowsInMonth(const year_month& ym, const weekday& firstdow) {
   return 2u + ceil<weeks>((weekday{ym / 1} - firstdow) + ((ym / last).day() - day{0})).count();
 }
 
-auto cldGetWeekForLine(const year_month& ym, const weekday& firstdow, const unsigned line)
-    -> const year_month_weekday {
+auto cldGetWeekForLine(const year_month& ym, const weekday& firstdow,
+                       const unsigned line) -> const year_month_weekday {
   unsigned index{line - 2};
   if (weekday{ym / 1} == firstdow) ++index;
   return ym / firstdow[index];
diff --git a/src/modules/dwl/tags.cpp b/src/modules/dwl/tags.cpp
index 085b8224..f8b250c8 100644
--- a/src/modules/dwl/tags.cpp
+++ b/src/modules/dwl/tags.cpp
@@ -53,8 +53,8 @@ static void set_layout(void *data, zdwl_ipc_output_v2 *zdwl_output_v2, uint32_t
   // Intentionally empty
 }
 
-static void appid(void *data, zdwl_ipc_output_v2 *zdwl_output_v2, const char *appid){
-    // Intentionally empty
+static void appid(void *data, zdwl_ipc_output_v2 *zdwl_output_v2, const char *appid) {
+  // Intentionally empty
 };
 
 static const zdwl_ipc_output_v2_listener output_status_listener_impl{
diff --git a/src/modules/hyprland/workspaces.cpp b/src/modules/hyprland/workspaces.cpp
index 047703cc..13364f3f 100644
--- a/src/modules/hyprland/workspaces.cpp
+++ b/src/modules/hyprland/workspaces.cpp
@@ -590,8 +590,8 @@ auto Workspaces::populateIconsMap(const Json::Value &formatIcons) -> void {
   m_iconsMap.emplace("", "");
 }
 
-auto Workspaces::populateBoolConfig(const Json::Value &config, const std::string &key, bool &member)
-    -> void {
+auto Workspaces::populateBoolConfig(const Json::Value &config, const std::string &key,
+                                    bool &member) -> void {
   const auto &configValue = config[key];
   if (configValue.isBool()) {
     member = configValue.asBool();
diff --git a/src/modules/image.cpp b/src/modules/image.cpp
index 8274d323..71e93b94 100644
--- a/src/modules/image.cpp
+++ b/src/modules/image.cpp
@@ -42,7 +42,6 @@ void waybar::modules::Image::refresh(int sig) {
 }
 
 auto waybar::modules::Image::update() -> void {
-  Glib::RefPtr<Gdk::Pixbuf> pixbuf;
   if (config_["path"].isString()) {
     path_ = config_["path"].asString();
   } else if (config_["exec"].isString()) {
@@ -51,19 +50,24 @@ auto waybar::modules::Image::update() -> void {
   } else {
     path_ = "";
   }
-  if (Glib::file_test(path_, Glib::FILE_TEST_EXISTS))
-    pixbuf = Gdk::Pixbuf::create_from_file(path_, size_, size_);
-  else
-    pixbuf = {};
 
-  if (pixbuf) {
+  if (Glib::file_test(path_, Glib::FILE_TEST_EXISTS)) {
+    Glib::RefPtr<Gdk::Pixbuf> pixbuf;
+
+    int scaled_icon_size = size_ * image_.get_scale_factor();
+    pixbuf = Gdk::Pixbuf::create_from_file(path_, scaled_icon_size, scaled_icon_size);
+
+    auto surface = Gdk::Cairo::create_surface_from_pixbuf(pixbuf, image_.get_scale_factor(),
+                                                          image_.get_window());
+    image_.set(surface);
+    image_.show();
+
     if (tooltipEnabled() && !tooltip_.empty()) {
       if (box_.get_tooltip_markup() != tooltip_) {
         box_.set_tooltip_markup(tooltip_);
       }
     }
-    image_.set(pixbuf);
-    image_.show();
+
     box_.get_style_context()->remove_class("empty");
   } else {
     image_.clear();
diff --git a/src/modules/memory/bsd.cpp b/src/modules/memory/bsd.cpp
index 67f9fed7..1d970e8a 100644
--- a/src/modules/memory/bsd.cpp
+++ b/src/modules/memory/bsd.cpp
@@ -21,13 +21,13 @@ static uint64_t get_total_memory() {
   u_long physmem;
 #endif
   int mib[] = {
-    CTL_HW,
+      CTL_HW,
 #if defined(HW_MEMSIZE)
-    HW_MEMSIZE,
+      HW_MEMSIZE,
 #elif defined(HW_PHYSMEM64)
-    HW_PHYSMEM64,
+      HW_PHYSMEM64,
 #else
-    HW_PHYSMEM,
+      HW_PHYSMEM,
 #endif
   };
   u_int miblen = sizeof(mib) / sizeof(mib[0]);
diff --git a/src/modules/niri/backend.cpp b/src/modules/niri/backend.cpp
new file mode 100644
index 00000000..383bf113
--- /dev/null
+++ b/src/modules/niri/backend.cpp
@@ -0,0 +1,261 @@
+#include "modules/niri/backend.hpp"
+
+#include <netdb.h>
+#include <netinet/in.h>
+#include <spdlog/spdlog.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#include <iostream>
+#include <string>
+#include <thread>
+
+#include "giomm/datainputstream.h"
+#include "giomm/dataoutputstream.h"
+#include "giomm/unixinputstream.h"
+#include "giomm/unixoutputstream.h"
+
+namespace waybar::modules::niri {
+
+int IPC::connectToSocket() {
+  const char *socket_path = getenv("NIRI_SOCKET");
+
+  if (socket_path == nullptr) {
+    spdlog::warn("Niri is not running, niri IPC will not be available.");
+    return -1;
+  }
+
+  struct sockaddr_un addr;
+  int socketfd = socket(AF_UNIX, SOCK_STREAM, 0);
+
+  if (socketfd == -1) {
+    throw std::runtime_error("socketfd failed");
+  }
+
+  addr.sun_family = AF_UNIX;
+
+  strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
+
+  addr.sun_path[sizeof(addr.sun_path) - 1] = 0;
+
+  int l = sizeof(struct sockaddr_un);
+
+  if (connect(socketfd, (struct sockaddr *)&addr, l) == -1) {
+    close(socketfd);
+    throw std::runtime_error("unable to connect");
+  }
+
+  return socketfd;
+}
+
+void IPC::startIPC() {
+  // will start IPC and relay events to parseIPC
+
+  std::thread([&]() {
+    int socketfd;
+    try {
+      socketfd = connectToSocket();
+    } catch (std::exception &e) {
+      spdlog::error("Niri IPC: failed to start, reason: {}", e.what());
+      return;
+    }
+    if (socketfd == -1) return;
+
+    spdlog::info("Niri IPC starting");
+
+    auto unix_istream = Gio::UnixInputStream::create(socketfd, true);
+    auto unix_ostream = Gio::UnixOutputStream::create(socketfd, false);
+    auto istream = Gio::DataInputStream::create(unix_istream);
+    auto ostream = Gio::DataOutputStream::create(unix_ostream);
+
+    if (!ostream->put_string("\"EventStream\"\n") || !ostream->flush()) {
+      spdlog::error("Niri IPC: failed to start event stream");
+      return;
+    }
+
+    std::string line;
+    if (!istream->read_line(line) || line != R"({"Ok":"Handled"})") {
+      spdlog::error("Niri IPC: failed to start event stream");
+      return;
+    }
+
+    while (istream->read_line(line)) {
+      spdlog::debug("Niri IPC: received {}", line);
+
+      try {
+        parseIPC(line);
+      } catch (std::exception &e) {
+        spdlog::warn("Failed to parse IPC message: {}, reason: {}", line, e.what());
+      } catch (...) {
+        throw;
+      }
+
+      std::this_thread::sleep_for(std::chrono::milliseconds(1));
+    }
+  }).detach();
+}
+
+void IPC::parseIPC(const std::string &line) {
+  const auto ev = parser_.parse(line);
+  const auto members = ev.getMemberNames();
+  if (members.size() != 1) throw std::runtime_error("Event must have a single member");
+
+  {
+    auto lock = lockData();
+
+    if (const auto &payload = ev["WorkspacesChanged"]) {
+      workspaces_.clear();
+      const auto &values = payload["workspaces"];
+      std::copy(values.begin(), values.end(), std::back_inserter(workspaces_));
+
+      std::sort(workspaces_.begin(), workspaces_.end(), [](const auto &a, const auto &b) {
+        const auto &aOutput = a["output"].asString();
+        const auto &bOutput = b["output"].asString();
+        const auto aIdx = a["idx"].asUInt();
+        const auto bIdx = b["idx"].asUInt();
+        if (aOutput == bOutput) return aIdx < bIdx;
+        return aOutput < bOutput;
+      });
+    } else if (const auto &payload = ev["WorkspaceActivated"]) {
+      const auto id = payload["id"].asUInt64();
+      const auto focused = payload["focused"].asBool();
+      auto it = std::find_if(workspaces_.begin(), workspaces_.end(),
+                             [id](const auto &ws) { return ws["id"].asUInt64() == id; });
+      if (it != workspaces_.end()) {
+        const auto &ws = *it;
+        const auto &output = ws["output"].asString();
+        for (auto &ws : workspaces_) {
+          const auto got_activated = (ws["id"].asUInt64() == id);
+          if (ws["output"] == output) ws["is_active"] = got_activated;
+
+          if (focused) ws["is_focused"] = got_activated;
+        }
+      } else {
+        spdlog::error("Activated unknown workspace");
+      }
+    } else if (const auto &payload = ev["WorkspaceActiveWindowChanged"]) {
+      const auto workspaceId = payload["workspace_id"].asUInt64();
+      auto it = std::find_if(workspaces_.begin(), workspaces_.end(), [workspaceId](const auto &ws) {
+        return ws["id"].asUInt64() == workspaceId;
+      });
+      if (it != workspaces_.end()) {
+        auto &ws = *it;
+        ws["active_window_id"] = payload["active_window_id"];
+      } else {
+        spdlog::error("Active window changed on unknown workspace");
+      }
+    } else if (const auto &payload = ev["KeyboardLayoutsChanged"]) {
+      const auto &layouts = payload["keyboard_layouts"];
+      const auto &names = layouts["names"];
+      keyboardLayoutCurrent_ = layouts["current_idx"].asUInt();
+
+      keyboardLayoutNames_.clear();
+      for (const auto &fullName : names) keyboardLayoutNames_.push_back(fullName.asString());
+    } else if (const auto &payload = ev["KeyboardLayoutSwitched"]) {
+      keyboardLayoutCurrent_ = payload["idx"].asUInt();
+    } else if (const auto &payload = ev["WindowsChanged"]) {
+      windows_.clear();
+      const auto &values = payload["windows"];
+      std::copy(values.begin(), values.end(), std::back_inserter(windows_));
+    } else if (const auto &payload = ev["WindowOpenedOrChanged"]) {
+      const auto &window = payload["window"];
+      const auto id = window["id"].asUInt64();
+      auto it = std::find_if(windows_.begin(), windows_.end(),
+                             [id](const auto &win) { return win["id"].asUInt64() == id; });
+      if (it == windows_.end()) {
+        windows_.push_back(window);
+
+        if (window["is_focused"].asBool()) {
+          for (auto &win : windows_) {
+            win["is_focused"] = win["id"].asUInt64() == id;
+          }
+        }
+      } else {
+        *it = window;
+      }
+    } else if (const auto &payload = ev["WindowClosed"]) {
+      const auto id = payload["id"].asUInt64();
+      auto it = std::find_if(windows_.begin(), windows_.end(),
+                             [id](const auto &win) { return win["id"].asUInt64() == id; });
+      if (it != windows_.end()) {
+        windows_.erase(it);
+      } else {
+        spdlog::error("Unknown window closed");
+      }
+    } else if (const auto &payload = ev["WindowFocusChanged"]) {
+      const auto focused = !payload["id"].isNull();
+      const auto id = payload["id"].asUInt64();
+      for (auto &win : windows_) {
+        win["is_focused"] = focused && win["id"].asUInt64() == id;
+      }
+    }
+  }
+
+  std::unique_lock lock(callbackMutex_);
+
+  for (auto &[eventname, handler] : callbacks_) {
+    if (eventname == members[0]) {
+      handler->onEvent(ev);
+    }
+  }
+}
+
+void IPC::registerForIPC(const std::string &ev, EventHandler *ev_handler) {
+  if (ev_handler == nullptr) {
+    return;
+  }
+
+  std::unique_lock lock(callbackMutex_);
+  callbacks_.emplace_back(ev, ev_handler);
+}
+
+void IPC::unregisterForIPC(EventHandler *ev_handler) {
+  if (ev_handler == nullptr) {
+    return;
+  }
+
+  std::unique_lock lock(callbackMutex_);
+
+  for (auto it = callbacks_.begin(); it != callbacks_.end();) {
+    auto &[eventname, handler] = *it;
+    if (handler == ev_handler) {
+      it = callbacks_.erase(it);
+    } else {
+      ++it;
+    }
+  }
+}
+
+Json::Value IPC::send(const Json::Value &request) {
+  int socketfd = connectToSocket();
+  if (socketfd == -1) throw std::runtime_error("Niri is not running");
+
+  auto unix_istream = Gio::UnixInputStream::create(socketfd, true);
+  auto unix_ostream = Gio::UnixOutputStream::create(socketfd, false);
+  auto istream = Gio::DataInputStream::create(unix_istream);
+  auto ostream = Gio::DataOutputStream::create(unix_ostream);
+
+  // Niri needs the request on a single line.
+  Json::StreamWriterBuilder builder;
+  builder["indentation"] = "";
+  std::unique_ptr<Json::StreamWriter> writer(builder.newStreamWriter());
+  std::ostringstream oss;
+  writer->write(request, &oss);
+  oss << '\n';
+
+  if (!ostream->put_string(oss.str()) || !ostream->flush())
+    throw std::runtime_error("error writing to niri socket");
+
+  std::string line;
+  if (!istream->read_line(line)) throw std::runtime_error("error reading from niri socket");
+
+  std::istringstream iss(std::move(line));
+  Json::Value response;
+  iss >> response;
+  return response;
+}
+
+}  // namespace waybar::modules::niri
diff --git a/src/modules/niri/language.cpp b/src/modules/niri/language.cpp
new file mode 100644
index 00000000..1e4d6d10
--- /dev/null
+++ b/src/modules/niri/language.cpp
@@ -0,0 +1,136 @@
+#include "modules/niri/language.hpp"
+
+#include <spdlog/spdlog.h>
+#include <xkbcommon/xkbcommon.h>
+#include <xkbcommon/xkbregistry.h>
+
+#include "util/string.hpp"
+
+namespace waybar::modules::niri {
+
+Language::Language(const std::string &id, const Bar &bar, const Json::Value &config)
+    : ALabel(config, "language", id, "{}", 0, true), bar_(bar) {
+  label_.hide();
+
+  if (!gIPC) gIPC = std::make_unique<IPC>();
+
+  gIPC->registerForIPC("KeyboardLayoutsChanged", this);
+  gIPC->registerForIPC("KeyboardLayoutSwitched", this);
+
+  updateFromIPC();
+  dp.emit();
+}
+
+Language::~Language() {
+  gIPC->unregisterForIPC(this);
+  // wait for possible event handler to finish
+  std::lock_guard<std::mutex> lock(mutex_);
+}
+
+void Language::updateFromIPC() {
+  std::lock_guard<std::mutex> lock(mutex_);
+  auto ipcLock = gIPC->lockData();
+
+  layouts_.clear();
+  for (const auto &fullName : gIPC->keyboardLayoutNames()) layouts_.push_back(getLayout(fullName));
+
+  current_idx_ = gIPC->keyboardLayoutCurrent();
+}
+
+/**
+ *  Language::doUpdate - update workspaces in UI thread.
+ *
+ * Note: some member fields are modified by both UI thread and event listener thread, use mutex_ to
+ *       protect these member fields, and lock should released before calling ALabel::update().
+ */
+void Language::doUpdate() {
+  std::lock_guard<std::mutex> lock(mutex_);
+
+  if (layouts_.size() <= current_idx_) {
+    spdlog::error("niri language layout index out of bounds");
+    label_.hide();
+    return;
+  }
+  const auto &layout = layouts_[current_idx_];
+
+  spdlog::debug("niri language update with full name {}", layout.full_name);
+  spdlog::debug("niri language update with short name {}", layout.short_name);
+  spdlog::debug("niri language update with short description {}", layout.short_description);
+  spdlog::debug("niri language update with variant {}", layout.variant);
+
+  std::string layoutName = std::string{};
+  if (config_.isMember("format-" + layout.short_description + "-" + layout.variant)) {
+    const auto propName = "format-" + layout.short_description + "-" + layout.variant;
+    layoutName = fmt::format(fmt::runtime(format_), config_[propName].asString());
+  } else if (config_.isMember("format-" + layout.short_description)) {
+    const auto propName = "format-" + layout.short_description;
+    layoutName = fmt::format(fmt::runtime(format_), config_[propName].asString());
+  } else {
+    layoutName = trim(fmt::format(fmt::runtime(format_), fmt::arg("long", layout.full_name),
+                                  fmt::arg("short", layout.short_name),
+                                  fmt::arg("shortDescription", layout.short_description),
+                                  fmt::arg("variant", layout.variant)));
+  }
+
+  spdlog::debug("niri language formatted layout name {}", layoutName);
+
+  if (!format_.empty()) {
+    label_.show();
+    label_.set_markup(layoutName);
+  } else {
+    label_.hide();
+  }
+}
+
+void Language::update() {
+  doUpdate();
+  ALabel::update();
+}
+
+void Language::onEvent(const Json::Value &ev) {
+  if (ev["KeyboardLayoutsChanged"]) {
+    updateFromIPC();
+  } else if (ev["KeyboardLayoutSwitched"]) {
+    std::lock_guard<std::mutex> lock(mutex_);
+    auto ipcLock = gIPC->lockData();
+    current_idx_ = gIPC->keyboardLayoutCurrent();
+  }
+
+  dp.emit();
+}
+
+Language::Layout Language::getLayout(const std::string &fullName) {
+  auto *const context = rxkb_context_new(RXKB_CONTEXT_LOAD_EXOTIC_RULES);
+  rxkb_context_parse_default_ruleset(context);
+
+  rxkb_layout *layout = rxkb_layout_first(context);
+  while (layout != nullptr) {
+    std::string nameOfLayout = rxkb_layout_get_description(layout);
+
+    if (nameOfLayout != fullName) {
+      layout = rxkb_layout_next(layout);
+      continue;
+    }
+
+    auto name = std::string(rxkb_layout_get_name(layout));
+    const auto *variantPtr = rxkb_layout_get_variant(layout);
+    std::string variant = variantPtr == nullptr ? "" : std::string(variantPtr);
+
+    const auto *descriptionPtr = rxkb_layout_get_brief(layout);
+    std::string description = descriptionPtr == nullptr ? "" : std::string(descriptionPtr);
+
+    Layout info = Layout{nameOfLayout, name, variant, description};
+
+    rxkb_context_unref(context);
+
+    return info;
+  }
+
+  rxkb_context_unref(context);
+
+  spdlog::debug("niri language didn't find matching layout for {}", fullName);
+
+  return Layout{"", "", "", ""};
+}
+
+}  // namespace waybar::modules::niri
diff --git a/src/modules/niri/window.cpp b/src/modules/niri/window.cpp
new file mode 100644
index 00000000..6e6fd36f
--- /dev/null
+++ b/src/modules/niri/window.cpp
@@ -0,0 +1,109 @@
+#include "modules/niri/window.hpp"
+
+#include <gtkmm/button.h>
+#include <gtkmm/label.h>
+#include <spdlog/spdlog.h>
+
+#include "util/rewrite_string.hpp"
+#include "util/sanitize_str.hpp"
+
+namespace waybar::modules::niri {
+
+Window::Window(const std::string &id, const Bar &bar, const Json::Value &config)
+    : AAppIconLabel(config, "window", id, "{title}", 0, true), bar_(bar) {
+  if (!gIPC) gIPC = std::make_unique<IPC>();
+
+  gIPC->registerForIPC("WindowsChanged", this);
+  gIPC->registerForIPC("WindowOpenedOrChanged", this);
+  gIPC->registerForIPC("WindowClosed", this);
+  gIPC->registerForIPC("WindowFocusChanged", this);
+
+  dp.emit();
+}
+
+Window::~Window() { gIPC->unregisterForIPC(this); }
+
+void Window::onEvent(const Json::Value &ev) { dp.emit(); }
+
+void Window::doUpdate() {
+  auto ipcLock = gIPC->lockData();
+
+  const auto &windows = gIPC->windows();
+  const auto &workspaces = gIPC->workspaces();
+
+  const auto separateOutputs = config_["separate-outputs"].asBool();
+  const auto ws_it = std::find_if(workspaces.cbegin(), workspaces.cend(), [&](const auto &ws) {
+    if (separateOutputs) {
+      return ws["is_active"].asBool() && ws["output"].asString() == bar_.output->name;
+    }
+
+    return ws["is_focused"].asBool();
+  });
+
+  std::vector<Json::Value>::const_iterator it;
+  if (ws_it == workspaces.cend() || (*ws_it)["active_window_id"].isNull()) {
+    it = windows.cend();
+  } else {
+    const auto id = (*ws_it)["active_window_id"].asUInt64();
+    it = std::find_if(windows.cbegin(), windows.cend(),
+                      [id](const auto &win) { return win["id"].asUInt64() == id; });
+  }
+
+  setClass("empty", ws_it == workspaces.cend() || (*ws_it)["active_window_id"].isNull());
+
+  if (it != windows.cend()) {
+    const auto &window = *it;
+
+    const auto title = window["title"].asString();
+    const auto appId = window["app_id"].asString();
+    const auto sanitizedTitle = waybar::util::sanitize_string(title);
+    const auto sanitizedAppId = waybar::util::sanitize_string(appId);
+
+    label_.show();
+    label_.set_markup(waybar::util::rewriteString(
+        fmt::format(fmt::runtime(format_), fmt::arg("title", sanitizedTitle),
+                    fmt::arg("app_id", sanitizedAppId)),
+        config_["rewrite"]));
+
+    updateAppIconName(appId, "");
+
+    if (tooltipEnabled()) label_.set_tooltip_text(title);
+
+    const auto id = window["id"].asUInt64();
+    const auto workspaceId = window["workspace_id"].asUInt64();
+    const auto isSolo = std::none_of(windows.cbegin(), windows.cend(), [&](const auto &win) {
+      return win["id"].asUInt64() != id && win["workspace_id"].asUInt64() == workspaceId;
+    });
+    setClass("solo", isSolo);
+    if (!appId.empty()) setClass(appId, isSolo);
+
+    if (oldAppId_ != appId) {
+      if (!oldAppId_.empty()) setClass(oldAppId_, false);
+      oldAppId_ = appId;
+    }
+  } else {
+    label_.hide();
+    updateAppIconName("", "");
+    setClass("solo", false);
+    if (!oldAppId_.empty()) setClass(oldAppId_, false);
+    oldAppId_.clear();
+  }
+}
+
+void Window::update() {
+  doUpdate();
+  AAppIconLabel::update();
+}
+
+void Window::setClass(const std::string &className, bool enable) {
+  auto styleContext = bar_.window.get_style_context();
+  if (enable) {
+    if (!styleContext->has_class(className)) {
+      styleContext->add_class(className);
+    }
+  } else {
+    styleContext->remove_class(className);
+  }
+}
+
+}  // namespace waybar::modules::niri
diff --git a/src/modules/niri/workspaces.cpp b/src/modules/niri/workspaces.cpp
new file mode 100644
index 00000000..d2fcad5d
--- /dev/null
+++ b/src/modules/niri/workspaces.cpp
@@ -0,0 +1,186 @@
+#include "modules/niri/workspaces.hpp"
+
+#include <gtkmm/button.h>
+#include <gtkmm/label.h>
+#include <spdlog/spdlog.h>
+
+namespace waybar::modules::niri {
+
+Workspaces::Workspaces(const std::string &id, const Bar &bar, const Json::Value &config)
+    : AModule(config, "workspaces", id, false, false), bar_(bar), box_(bar.orientation, 0) {
+  box_.set_name("workspaces");
+  if (!id.empty()) {
+    box_.get_style_context()->add_class(id);
+  }
+  box_.get_style_context()->add_class(MODULE_CLASS);
+  event_box_.add(box_);
+
+  if (!gIPC) gIPC = std::make_unique<IPC>();
+
+  gIPC->registerForIPC("WorkspacesChanged", this);
+  gIPC->registerForIPC("WorkspaceActivated", this);
+  gIPC->registerForIPC("WorkspaceActiveWindowChanged", this);
+
+  dp.emit();
+}
+
+Workspaces::~Workspaces() { gIPC->unregisterForIPC(this); }
+
+void Workspaces::onEvent(const Json::Value &ev) { dp.emit(); }
+
+void Workspaces::doUpdate() {
+  auto ipcLock = gIPC->lockData();
+
+  const auto alloutputs = config_["all-outputs"].asBool();
+  std::vector<Json::Value> my_workspaces;
+  const auto &workspaces = gIPC->workspaces();
+  std::copy_if(workspaces.cbegin(), workspaces.cend(), std::back_inserter(my_workspaces),
+               [&](const auto &ws) {
+                 if (alloutputs) return true;
+                 return ws["output"].asString() == bar_.output->name;
+               });
+
+  // Remove buttons for removed workspaces.
+  for (auto it = buttons_.begin(); it != buttons_.end();) {
+    auto ws = std::find_if(my_workspaces.begin(), my_workspaces.end(),
+                           [it](const auto &ws) { return ws["id"].asUInt64() == it->first; });
+    if (ws == my_workspaces.end()) {
+      it = buttons_.erase(it);
+    } else {
+      ++it;
+    }
+  }
+
+  // Add buttons for new workspaces, update existing ones.
+  for (const auto &ws : my_workspaces) {
+    auto bit = buttons_.find(ws["id"].asUInt64());
+    auto &button = bit == buttons_.end() ? addButton(ws) : bit->second;
+    auto style_context = button.get_style_context();
+
+    if (ws["is_focused"].asBool())
+      style_context->add_class("focused");
+    else
+      style_context->remove_class("focused");
+
+    if (ws["is_active"].asBool())
+      style_context->add_class("active");
+    else
+      style_context->remove_class("active");
+
+    if (ws["output"]) {
+      if (ws["output"].asString() == bar_.output->name)
+        style_context->add_class("current_output");
+      else
+        style_context->remove_class("current_output");
+    } else {
+      style_context->remove_class("current_output");
+    }
+
+    if (ws["active_window_id"].isNull())
+      style_context->add_class("empty");
+    else
+      style_context->remove_class("empty");
+
+    std::string name;
+    if (ws["name"]) {
+      name = ws["name"].asString();
+    } else {
+      name = std::to_string(ws["idx"].asUInt());
+    }
+    button.set_name("niri-workspace-" + name);
+
+    if (config_["format"].isString()) {
+      auto format = config_["format"].asString();
+      name = fmt::format(fmt::runtime(format), fmt::arg("icon", getIcon(name, ws)),
+                         fmt::arg("value", name), fmt::arg("name", ws["name"].asString()),
+                         fmt::arg("index", ws["idx"].asUInt()),
+                         fmt::arg("output", ws["output"].asString()));
+    }
+    if (!config_["disable-markup"].asBool()) {
+      static_cast<Gtk::Label *>(button.get_children()[0])->set_markup(name);
+    } else {
+      button.set_label(name);
+    }
+
+    if (config_["current-only"].asBool()) {
+      const auto *property = alloutputs ? "is_focused" : "is_active";
+      if (ws[property].asBool())
+        button.show();
+      else
+        button.hide();
+    } else {
+      button.show();
+    }
+  }
+
+  // Refresh the button order.
+  for (auto it = my_workspaces.cbegin(); it != my_workspaces.cend(); ++it) {
+    const auto &ws = *it;
+
+    auto pos = ws["idx"].asUInt() - 1;
+    if (alloutputs) pos = it - my_workspaces.cbegin();
+
+    auto &button = buttons_[ws["id"].asUInt64()];
+    box_.reorder_child(button, pos);
+  }
+}
+
+void Workspaces::update() {
+  doUpdate();
+  AModule::update();
+}
+
+Gtk::Button &Workspaces::addButton(const Json::Value &ws) {
+  std::string name;
+  if (ws["name"]) {
+    name = ws["name"].asString();
+  } else {
+    name = std::to_string(ws["idx"].asUInt());
+  }
+
+  auto pair = buttons_.emplace(ws["id"].asUInt64(), name);
+  auto &&button = pair.first->second;
+  box_.pack_start(button, false, false, 0);
+  button.set_relief(Gtk::RELIEF_NONE);
+  if (!config_["disable-click"].asBool()) {
+    const auto id = ws["id"].asUInt64();
+    button.signal_pressed().connect([=] {
+      try {
+        // {"Action":{"FocusWorkspace":{"reference":{"Id":1}}}}
+        Json::Value request(Json::objectValue);
+        auto &action = (request["Action"] = Json::Value(Json::objectValue));
+        auto &focusWorkspace = (action["FocusWorkspace"] = Json::Value(Json::objectValue));
+        auto &reference = (focusWorkspace["reference"] = Json::Value(Json::objectValue));
+        reference["Id"] = id;
+
+        IPC::send(request);
+      } catch (const std::exception &e) {
+        spdlog::error("Error switching workspace: {}", e.what());
+      }
+    });
+  }
+  return button;
+}
+
+std::string Workspaces::getIcon(const std::string &value, const Json::Value &ws) {
+  const auto &icons = config_["format-icons"];
+  if (!icons) return value;
+
+  if (ws["is_focused"].asBool() && icons["focused"]) return icons["focused"].asString();
+
+  if (ws["is_active"].asBool() && icons["active"]) return icons["active"].asString();
+
+  if (ws["name"]) {
+    const auto &name = ws["name"].asString();
+    if (icons[name]) return icons[name].asString();
+  }
+
+  const auto idx = ws["idx"].asString();
+  if (icons[idx]) return icons[idx].asString();
+
+  if (icons["default"]) return icons["default"].asString();
+
+  return value;
+}
+
+}  // namespace waybar::modules::niri
diff --git a/src/modules/power_profiles_daemon.cpp b/src/modules/power_profiles_daemon.cpp
index eaa47023..3ae3ae83 100644
--- a/src/modules/power_profiles_daemon.cpp
+++ b/src/modules/power_profiles_daemon.cpp
@@ -204,7 +204,7 @@ void PowerProfilesDaemon::setPropCb(Glib::RefPtr<Gio::AsyncResult>& r) {
     auto _ = powerProfilesProxy_->call_finish(r);
     dp.emit();
   } catch (const std::exception& e) {
-    spdlog::error("Failed to set the the active power profile: {}", e.what());
+    spdlog::error("Failed to set the active power profile: {}", e.what());
   } catch (const Glib::Error& e) {
     spdlog::error("Failed to set the active power profile: {}", std::string(e.what()));
   }
diff --git a/src/modules/sni/item.cpp b/src/modules/sni/item.cpp
index 6c4ec8c0..8afb39fb 100644
--- a/src/modules/sni/item.cpp
+++ b/src/modules/sni/item.cpp
@@ -104,9 +104,11 @@ void Item::proxyReady(Glib::RefPtr<Gio::AsyncResult>& result) {
     this->updateImage();
 
   } catch (const Glib::Error& err) {
-    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path, err.what());
+    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path,
+                  std::string(err.what()));
   } catch (const std::exception& err) {
-    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path, err.what());
+    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path,
+                  std::string(err.what()));
   }
 }
 
@@ -124,14 +126,15 @@ ToolTip get_variant<ToolTip>(const Glib::VariantBase& value) {
   result.text = get_variant<Glib::ustring>(container.get_child(2));
   auto description = get_variant<Glib::ustring>(container.get_child(3));
   if (!description.empty()) {
-    result.text = fmt::format("<b>{}</b>\n{}", result.text, description);
+    result.text = fmt::format("<b>{}</b>\n{}", std::string(result.text), std::string(description));
   }
   return result;
 }
 
 void Item::setProperty(const Glib::ustring& name, Glib::VariantBase& value) {
   try {
-    spdlog::trace("Set tray item property: {}.{} = {}", id.empty() ? bus_name : id, name, value);
+    spdlog::trace("Set tray item property: {}.{} = {}", id.empty() ? bus_name : id,
+                  std::string(name), get_variant<std::string>(value));
 
     if (name == "Category") {
       category = get_variant<std::string>(value);
@@ -176,10 +179,12 @@ void Item::setProperty(const Glib::ustring& name, Glib::VariantBase& value) {
     }
   } catch (const Glib::Error& err) {
     spdlog::warn("Failed to set tray item property: {}.{}, value = {}, err = {}",
-                 id.empty() ? bus_name : id, name, value, err.what());
+                 id.empty() ? bus_name : id, std::string(name), get_variant<std::string>(value),
+                 std::string(err.what()));
   } catch (const std::exception& err) {
     spdlog::warn("Failed to set tray item property: {}.{}, value = {}, err = {}",
-                 id.empty() ? bus_name : id, name, value, err.what());
+                 id.empty() ? bus_name : id, std::string(name), get_variant<std::string>(value),
+                 std::string(err.what()));
   }
 }
 
@@ -221,9 +226,9 @@ void Item::processUpdatedProperties(Glib::RefPtr<Gio::AsyncResult>& _result) {
 
     this->updateImage();
   } catch (const Glib::Error& err) {
-    spdlog::warn("Failed to update properties: {}", err.what());
+    spdlog::warn("Failed to update properties: {}", std::string(err.what()));
   } catch (const std::exception& err) {
-    spdlog::warn("Failed to update properties: {}", err.what());
+    spdlog::warn("Failed to update properties: {}", std::string(err.what()));
   }
   update_pending_.clear();
 }
@@ -245,7 +250,7 @@ static const std::map<std::string_view, std::set<std::string_view>> signal2props
 
 void Item::onSignal(const Glib::ustring& sender_name, const Glib::ustring& signal_name,
                     const Glib::VariantContainerBase& arguments) {
-  spdlog::trace("Tray item '{}' got signal {}", id, signal_name);
+  spdlog::trace("Tray item '{}' got signal {}", id, std::string(signal_name));
   auto changed = signal2props.find(signal_name.raw());
   if (changed != signal2props.end()) {
     if (update_pending_.empty()) {
diff --git a/src/modules/upower.cpp b/src/modules/upower.cpp
index 552495f8..5ee6d64c 100644
--- a/src/modules/upower.cpp
+++ b/src/modules/upower.cpp
@@ -384,10 +384,11 @@ void UPower::setDisplayDevice() {
               displayDevice = upDevice;
             }
           }
-          // Unref current upDevice
-          if (displayDevice.upDevice != NULL) g_object_unref(thisPtr->upDevice_.upDevice);
-          // Reassign new upDevice
-          thisPtr->upDevice_ = displayDevice;
+          // Unref current upDevice if it exists
+          if (displayDevice.upDevice != NULL) {
+            if (thisPtr->upDevice_.upDevice != NULL) g_object_unref(thisPtr->upDevice_.upDevice);
+            thisPtr->upDevice_ = displayDevice;
+          }
         },
         this);
   }
diff --git a/src/modules/wlr/workspace_manager.cpp b/src/modules/wlr/workspace_manager.cpp
index f556a161..3c630d81 100644
--- a/src/modules/wlr/workspace_manager.cpp
+++ b/src/modules/wlr/workspace_manager.cpp
@@ -118,8 +118,8 @@ auto WorkspaceManager::sort_workspaces() -> void {
   }
 }
 
-auto WorkspaceManager::register_manager(wl_registry *registry, uint32_t name, uint32_t version)
-    -> void {
+auto WorkspaceManager::register_manager(wl_registry *registry, uint32_t name,
+                                        uint32_t version) -> void {
   if (workspace_manager_) {
     spdlog::warn("Register workspace manager again although already registered!");
     return;
diff --git a/subprojects/catch2.wrap b/subprojects/catch2.wrap
index f2dfd57c..489db6c6 100644
--- a/subprojects/catch2.wrap
+++ b/subprojects/catch2.wrap
@@ -1,10 +1,10 @@
 [wrap-file]
-directory = Catch2-3.5.1
-source_url = https://github.com/catchorg/Catch2/archive/v3.5.1.tar.gz
-source_filename = Catch2-3.5.1.tar.gz
-source_hash = 49c3ca7a68f1c8ec71307736bc6ed14fec21631707e1be9af45daf4037e75a08
-# source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/catch2_3.4.0-1/Catch2-3.4.0.tar.gz
-# wrapdb_version = 3.4.0-1
+directory = Catch2-3.7.0
+source_url = https://github.com/catchorg/Catch2/archive/v3.7.0.tar.gz
+source_filename = Catch2-3.7.0.tar.gz
+source_hash = 5b10cd536fa3818112a82820ce0787bd9f2a906c618429e7c4dea639983c8e88
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/catch2_3.7.0-1/Catch2-3.7.0.tar.gz
+wrapdb_version = 3.7.0-1
 
 [provide]
 catch2 = catch2_dep
diff --git a/subprojects/fmt.wrap b/subprojects/fmt.wrap
index 9efe101e..42b61596 100644
--- a/subprojects/fmt.wrap
+++ b/subprojects/fmt.wrap
@@ -1,13 +1,13 @@
 [wrap-file]
-directory = fmt-9.1.0
-source_url = https://github.com/fmtlib/fmt/archive/9.1.0.tar.gz
-source_filename = fmt-9.1.0.tar.gz
-source_hash = 5dea48d1fcddc3ec571ce2058e13910a0d4a6bab4cc09a809d8b1dd1c88ae6f2
-patch_filename = fmt_9.1.0-2_patch.zip
-patch_url = https://wrapdb.mesonbuild.com/v2/fmt_9.1.0-2/get_patch
-patch_hash = 23e8c4829f3e63f509b5643fe6bb87cbed39eae9594c451b338475d14d051967
-source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/fmt_9.1.0-2/fmt-9.1.0.tar.gz
-wrapdb_version = 9.1.0-2
+directory = fmt-11.0.1
+source_url = https://github.com/fmtlib/fmt/archive/11.0.1.tar.gz
+source_filename = fmt-11.0.1.tar.gz
+source_hash = 7d009f7f89ac84c0a83f79ed602463d092fbf66763766a907c97fd02b100f5e9
+patch_filename = fmt_11.0.1-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/fmt_11.0.1-1/get_patch
+patch_hash = 0a8b93d1ee6d84a82d3872a9bfb4c3977d8a53f7f484d42d1f7ed63ed496d549
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/fmt_11.0.1-1/fmt-11.0.1.tar.gz
+wrapdb_version = 11.0.1-1
 
 [provide]
 fmt = fmt_dep
diff --git a/subprojects/gtk-layer-shell.wrap b/subprojects/gtk-layer-shell.wrap
index cb730345..fc0ddf74 100644
--- a/subprojects/gtk-layer-shell.wrap
+++ b/subprojects/gtk-layer-shell.wrap
@@ -1,5 +1,5 @@
 [wrap-file]
-directory = gtk-layer-shell-0.8.2
-source_filename = gtk-layer-shell-0.8.2.tar.gz
-source_hash = 254dd246303127c5d5236ea640f01a82e35d2d652a48d139dd669c832a0f0dce
-source_url = https://github.com/wmww/gtk-layer-shell/archive/v0.8.2/gtk-layer-shell-0.8.2.tar.gz
+directory = gtk-layer-shell-0.9.0
+source_filename = gtk-layer-shell-0.9.0.tar.gz
+source_hash = 3809e5565d9ed02e44bb73787ff218523e8760fef65830afe60ea7322e22da1c
+source_url = https://github.com/wmww/gtk-layer-shell/archive/v0.9.0/gtk-layer-shell-0.9.0.tar.gz
diff --git a/subprojects/spdlog.wrap b/subprojects/spdlog.wrap
index 08004c90..af00d5a7 100644
--- a/subprojects/spdlog.wrap
+++ b/subprojects/spdlog.wrap
@@ -1,13 +1,13 @@
 [wrap-file]
-directory = spdlog-1.12.0
-source_url = https://github.com/gabime/spdlog/archive/refs/tags/v1.12.0.tar.gz
-source_filename = spdlog-1.12.0.tar.gz
-source_hash = 4dccf2d10f410c1e2feaff89966bfc49a1abb29ef6f08246335b110e001e09a9
-patch_filename = spdlog_1.12.0-2_patch.zip
-patch_url = https://wrapdb.mesonbuild.com/v2/spdlog_1.12.0-2/get_patch
-patch_hash = 9596972d1eb2e0a69cea4a53273ca7bbbcb9b2fa872cd734864fc7232dc2d573
-source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/spdlog_1.12.0-2/spdlog-1.12.0.tar.gz
-wrapdb_version = 1.12.0-2
+directory = spdlog-1.14.1
+source_url = https://github.com/gabime/spdlog/archive/refs/tags/v1.14.1.tar.gz
+source_filename = spdlog-1.14.1.tar.gz
+source_hash = 1586508029a7d0670dfcb2d97575dcdc242d3868a259742b69f100801ab4e16b
+patch_filename = spdlog_1.14.1-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/spdlog_1.14.1-1/get_patch
+patch_hash = ae878e732330ea1048f90d7e117c40c0cd2a6fb8ae5492c7955818ce3aaade6c
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/spdlog_1.14.1-1/spdlog-1.14.1.tar.gz
+wrapdb_version = 1.14.1-1
 
 [provide]
 spdlog = spdlog_dep
diff --git a/test/utils/SafeSignal.cpp b/test/utils/SafeSignal.cpp
index 341e8e2e..e7e096b0 100644
--- a/test/utils/SafeSignal.cpp
+++ b/test/utils/SafeSignal.cpp
@@ -71,7 +71,7 @@ struct TestObject {
   unsigned copied = 0;
   unsigned moved = 0;
 
-  TestObject(const T& v) : value(v){};
+  TestObject(const T& v) : value(v) {};
   ~TestObject() = default;
 
   TestObject(const TestObject& other)