diff --git a/flutter/android/app/build.gradle b/flutter/android/app/build.gradle
index 3793c1f4c..9973c8f62 100644
--- a/flutter/android/app/build.gradle
+++ b/flutter/android/app/build.gradle
@@ -93,6 +93,7 @@ android {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig signingConfigs.release
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules'
         }
     }
 }
diff --git a/flutter/android/app/proguard-rules b/flutter/android/app/proguard-rules
new file mode 100644
index 000000000..0b12a6cda
--- /dev/null
+++ b/flutter/android/app/proguard-rules
@@ -0,0 +1,4 @@
+# Keep class members from protobuf generated code.
+-keepclassmembers class * extends com.google.protobuf.GeneratedMessageLite {
+  <fields>;
+}
\ No newline at end of file