diff --git a/library.properties b/library.properties
index 9b26c35..d223ed8 100644
--- a/library.properties
+++ b/library.properties
@@ -1,6 +1,6 @@
 name=MFRC522
-#date as version
-version=20150405
+#date as version - no leading zero
+version=2015.9.4
 author=GithubCommunity
 maintainer=miguelbalboa
 sentence=Arduino RFID Library for MFRC522 (SPI)