diff --git a/src/AModule.cpp b/src/AModule.cpp
index 354d1bf9..da43259d 100644
--- a/src/AModule.cpp
+++ b/src/AModule.cpp
@@ -29,7 +29,7 @@ AModule::~AModule() {
 }
 
 auto AModule::update() -> void {
-  // Nothing here
+  pid_.push_back(util::command::forkExec(config_["on-update"].asString()));
 }
 
 bool AModule::handleToggle(GdkEventButton* const& e) {
diff --git a/src/modules/backlight.cpp b/src/modules/backlight.cpp
index b38f2603..8b63bd6c 100644
--- a/src/modules/backlight.cpp
+++ b/src/modules/backlight.cpp
@@ -175,6 +175,11 @@ auto waybar::modules::Backlight::update() -> void {
       return;
     }
 
+    // Run user-provided update handler if configured
+    if (config_["on-update"].isString()) {
+      AModule::update();
+    }
+
     const auto percent = best->get_max() == 0 ? 100 : best->get_actual() * 100 / best->get_max();
     label_.set_markup(fmt::format(
         format_, fmt::arg("percent", std::to_string(percent)), fmt::arg("icon", getIcon(percent))));
diff --git a/src/modules/battery.cpp b/src/modules/battery.cpp
index 61ed50a4..b50c38a6 100644
--- a/src/modules/battery.cpp
+++ b/src/modules/battery.cpp
@@ -149,6 +149,11 @@ const std::string waybar::modules::Battery::formatTimeRemaining(float hoursRemai
 }
 
 auto waybar::modules::Battery::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   auto [capacity, time_remaining, status] = getInfos();
   if (status == "Unknown") {
     status = getAdapterStatus(capacity);
diff --git a/src/modules/clock.cpp b/src/modules/clock.cpp
index 2fa02142..5a781ef7 100644
--- a/src/modules/clock.cpp
+++ b/src/modules/clock.cpp
@@ -13,6 +13,11 @@ waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
 }
 
 auto waybar::modules::Clock::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   tzset(); // Update timezone information
   auto now = std::chrono::system_clock::now();
   auto localtime = fmt::localtime(std::chrono::system_clock::to_time_t(now));
diff --git a/src/modules/cpu.cpp b/src/modules/cpu.cpp
index 298f7a46..33d0d531 100644
--- a/src/modules/cpu.cpp
+++ b/src/modules/cpu.cpp
@@ -10,6 +10,11 @@ waybar::modules::Cpu::Cpu(const std::string& id, const Json::Value& config)
 }
 
 auto waybar::modules::Cpu::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   // TODO: as creating dynamic fmt::arg arrays is buggy we have to calc both
   auto cpu_load = getCpuLoad();
   auto [cpu_usage, tooltip] = getCpuUsage();
diff --git a/src/modules/custom.cpp b/src/modules/custom.cpp
index ca095088..1853b2fa 100644
--- a/src/modules/custom.cpp
+++ b/src/modules/custom.cpp
@@ -93,6 +93,11 @@ bool waybar::modules::Custom::handleToggle(GdkEventButton* const& e) {
 }
 
 auto waybar::modules::Custom::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   // Hide label if output is empty
   if (config_["exec"].isString() && (output_.out.empty() || output_.exit_code != 0)) {
     event_box_.hide();
diff --git a/src/modules/idle_inhibitor.cpp b/src/modules/idle_inhibitor.cpp
index e5460ad8..c39e0114 100644
--- a/src/modules/idle_inhibitor.cpp
+++ b/src/modules/idle_inhibitor.cpp
@@ -26,6 +26,11 @@ waybar::modules::IdleInhibitor::~IdleInhibitor() {
 }
 
 auto waybar::modules::IdleInhibitor::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   label_.set_markup(
       fmt::format(format_, fmt::arg("status", status_), fmt::arg("icon", getIcon(0, status_))));
   label_.get_style_context()->add_class(status_);
diff --git a/src/modules/memory.cpp b/src/modules/memory.cpp
index eeb92bfe..3e1ed746 100644
--- a/src/modules/memory.cpp
+++ b/src/modules/memory.cpp
@@ -9,6 +9,11 @@ waybar::modules::Memory::Memory(const std::string& id, const Json::Value& config
 }
 
 auto waybar::modules::Memory::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   parseMeminfo();
   if (memtotal_ > 0 && memfree_ >= 0) {
     auto total_ram_gigabytes = memtotal_ / std::pow(1024, 2);
diff --git a/src/modules/mpd.cpp b/src/modules/mpd.cpp
index 7bad855b..f61dfc40 100644
--- a/src/modules/mpd.cpp
+++ b/src/modules/mpd.cpp
@@ -35,6 +35,11 @@ waybar::modules::MPD::MPD(const std::string& id, const Json::Value& config)
 }
 
 auto waybar::modules::MPD::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   std::lock_guard guard(connection_lock_);
   tryConnect();
 
diff --git a/src/modules/network.cpp b/src/modules/network.cpp
index ba196cff..9513a93d 100644
--- a/src/modules/network.cpp
+++ b/src/modules/network.cpp
@@ -228,6 +228,11 @@ const std::string waybar::modules::Network::getNetworkState() const {
 }
 
 auto waybar::modules::Network::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   std::lock_guard<std::mutex> lock(mutex_);
   std::string                 tooltip_format;
   auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
diff --git a/src/modules/pulseaudio.cpp b/src/modules/pulseaudio.cpp
index ef2bc273..e336825c 100644
--- a/src/modules/pulseaudio.cpp
+++ b/src/modules/pulseaudio.cpp
@@ -196,6 +196,11 @@ const std::string waybar::modules::Pulseaudio::getPortIcon() const {
 }
 
 auto waybar::modules::Pulseaudio::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   auto format = format_;
   std::string format_name = "format";
   if (monitor_.find("a2dp_sink") != std::string::npos) {
diff --git a/src/modules/temperature.cpp b/src/modules/temperature.cpp
index 78391a0d..d17c2ad8 100644
--- a/src/modules/temperature.cpp
+++ b/src/modules/temperature.cpp
@@ -19,6 +19,11 @@ waybar::modules::Temperature::Temperature(const std::string& id, const Json::Val
 }
 
 auto waybar::modules::Temperature::update() -> void {
+  // Run user-provided update handler if configured
+  if (config_["on-update"].isString()) {
+    AModule::update();
+  }
+
   auto [temperature_c, temperature_f] = getTemperature();
   auto critical = isCritical(temperature_c);
   auto format = format_;