Prepare for 2.6.6
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 00053a7..fcf5252 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -14,7 +14,7 @@
 === Releases ===
 ------------------------------------------------------------------------
 
-2.6.6 (not yet released)
+2.6.6 (05-Apr-2016)
 
 #248: VersionUtil.versionFor() unexpectedly return null instead of Version.unknownVersion()
  (reported by sammyhk@github)