diff --git a/app/build.gradle b/app/build.gradle
index 467387b6..061985c9 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -40,6 +40,7 @@ dependencies {
     implementation 'com.squareup.okhttp3:okhttp:3.12.13'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'cn.wanghaomiao:JsoupXpath:2.5.1'
+    implementation 'org.nanohttpd:nanohttpd:2.3.1'
     implementation 'com.google.zxing:core:3.3.0'
     //implementation 'com.orhanobut:logger:2.2.0'
     implementation 'org.jsoup:jsoup:1.15.3'
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 9745527d..00a3288d 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -24,6 +24,9 @@
 -keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
 -keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken
 
+# Nano
+-keep class fi.iki.elonen.** { *; }
+
 # OkHttp
 -dontwarn okhttp3.**
 -keep class okio.** { *; }