diff --git a/rhino/proguard-rules.pro b/rhino/proguard-rules.pro
index bfd6debda..1a2e575b0 100644
--- a/rhino/proguard-rules.pro
+++ b/rhino/proguard-rules.pro
@@ -23,5 +23,7 @@
 ## Rhino
 -keep class com.script.** { *; }
 -keep class javax.script.** { *; }
+-keep class java.lang.** { *; }
+-keep class java.util.function.** { *; }
 -keep class com.sun.script.javascript.** { *; }
 -keep class org.mozilla.javascript.** { *; }
\ No newline at end of file