diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 481bb43..a42b692 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -18,4 +18,7 @@
 
 # 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
+
+# Keep protobuf autogenerated classes
+-keep class * extends com.google.protobuf.GeneratedMessageLite { *; }
\ No newline at end of file