diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 5dd8dc61..1ae3546f 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -29,5 +29,7 @@
     kotlinx.serialization.KSerializer serializer(...);
 }
 
-# Commons
+# Gson
 -keep class com.simplemobiletools.commons.models.SimpleContact { *; }
+-keep class com.simplemobiletools.smsmessenger.models.Attachment { *; }
+-keep class com.simplemobiletools.smsmessenger.models.MessageAttachment { *; }