diff --git a/decoder/proguard-rules.pro b/decoder/proguard-rules.pro
index 481bb43..ca7a642 100644
--- a/decoder/proguard-rules.pro
+++ b/decoder/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
+-keep public class dgca.verifier.app.decoder.model.*
+-keep public class com.github.fge.jsonschema.** { *; }
\ No newline at end of file