diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index e69de29b..50dfb901 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -0,0 +1,5 @@
+# ez-vcard
+-keep,includedescriptorclasses class ezvcard.property.** { *; }
+-keep enum ezvcard.VCardVersion { *; }
+-dontwarn ezvcard.io.json.**
+-dontwarn freemarker.**