diff --git a/main/proguard-rules.pro b/main/proguard-rules.pro
index 481bb434..7b8a3bf8 100644
--- a/main/proguard-rules.pro
+++ b/main/proguard-rules.pro
@@ -18,4 +18,6 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
\ No newline at end of file
+#-renamesourcefileattribute SourceFile
+
+-keepclassmembers class io.github.firemaples.models.** { *; }