diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index e69de29..bca4b03 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -0,0 +1 @@
+-keep class * extends com.google.protobuf.GeneratedMessageLite { *; }