diff --git a/Kuroba/app/proguard.cfg b/Kuroba/app/proguard.cfg
index 58dbb3b8b..253dac1cf 100644
--- a/Kuroba/app/proguard.cfg
+++ b/Kuroba/app/proguard.cfg
@@ -143,4 +143,6 @@
 -keep public class * implements java.lang.reflect.Type
 
 -keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
--keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken
\ No newline at end of file
+-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken
+
+-keep class java.lang.invoke.StringConcatFactory { *; }
\ No newline at end of file