prepare for 2.6.4
diff --git a/release-notes/VERSION b/release-notes/VERSION
index b554c5e..87f08e8 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -4,7 +4,7 @@
 === Releases ===
 ------------------------------------------------------------------------
 
-2.6.4 (not yet released)
+2.6.4 (07-Dec-2015)
 
 #984: JsonStreamContexts are not build the same way for write.. and convert methods
  (reported by Antibrumm@github)