diff --git a/app/build.gradle b/app/build.gradle
index c901829a9e..a5e9a1350a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -46,7 +46,7 @@ android {
 
         release {
             minifyEnabled true
-            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
+            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro"
             signingConfig signingConfigs.release
         }
 
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 6a3d447dcf..a87deef1de 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -19,10 +19,39 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
--keepclassmembers enum * { *; }
 
--keep class io.github.sds100.keymapper.** { *; }
--keep interface io.github.sds100.keymapper.** { *; }
+-keepclassmembers enum * {
+ public static **[] values();
+ public static ** valueOf(java.lang.String);
+ }
+
+-keepattributes Signature
+
+# For using GSON @Expose annotation
+-keepattributes *Annotation*
+
+# Gson specific classes
+-dontwarn sun.misc.**
+#-keep class com.google.gson.stream.** { *; }
+
+# Keep data entities so proguard doesn't break serialization/deserialization.
+-keep class io.github.sds100.keymapper.data.entities.** { <fields>; }
+
+# Prevent proguard from stripping interface information from TypeAdapter, TypeAdapterFactory,
+# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
+-keep class * extends com.google.gson.TypeAdapter
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer
+
+# Prevent R8 from leaving Data object members always null
+-keepclassmembers,allowobfuscation class * {
+  @com.google.gson.annotations.SerializedName <fields>;
+}
+
+# Retain generic signatures of TypeToken and its subclasses with R8 version 3.0 and higher.
+-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
+-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken
 
 -keep class com.google.android.material.** { *; }
 
diff --git a/fastlane/metadata/android/uk_UA/full_description.txt b/fastlane/metadata/android/uk/full_description.txt
similarity index 100%
rename from fastlane/metadata/android/uk_UA/full_description.txt
rename to fastlane/metadata/android/uk/full_description.txt
diff --git a/fastlane/metadata/android/uk_UA/short_description.txt b/fastlane/metadata/android/uk/short_description.txt
similarity index 100%
rename from fastlane/metadata/android/uk_UA/short_description.txt
rename to fastlane/metadata/android/uk/short_description.txt
diff --git a/fastlane/metadata/android/uk_UA/title.txt b/fastlane/metadata/android/uk/title.txt
similarity index 100%
rename from fastlane/metadata/android/uk_UA/title.txt
rename to fastlane/metadata/android/uk/title.txt