diff --git a/proguard-rules.pro b/proguard-rules.pro
index 5a0ad26d..34a54376 100644
--- a/proguard-rules.pro
+++ b/proguard-rules.pro
@@ -29,4 +29,7 @@
 -dontwarn io.netty.**
 -dontwarn org.spongycastle.**
 
--keepattributes SourceFile,LineNumberTable
+-keepattributes SourceFile,LineNumberTable,Signature
+
+-keep class org.spongycastle.** {*;}
+-keep class org.bouncycastle.** {*;}