diff --git a/Changelog.md b/Changelog.md
index 9310c1b..3b7d45e 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -15,6 +15,25 @@ Note to mainainers:
 * The following excerpt is only usefull when rendered in the website.
 {:toc}
 
+### OfflineIMAP v6.6.0 (2015-12-05)
+
+#### Features
+
+- Maildir learns to mimic Dovecot's format of lower-case letters (a,b,c..) for
+  "custom flags" or user keywords.
+
+#### Fixes
+
+- Broken retry loop would break connection management.
+- Replace rogue `print` statement by `self.ui.debug`.
+
+#### Changes
+
+- Bump imaplib2 from v2.52 to v2.53.
+- Code cleanups.
+- Add a full stack of all thread dump upon EXIT or KILL signal in thread debug
+  mode.
+
 
 ### OfflineIMAP v6.6.0-rc3 (2015-11-05)
 
diff --git a/offlineimap/__init__.py b/offlineimap/__init__.py
index aa19add..1ee59d0 100644
--- a/offlineimap/__init__.py
+++ b/offlineimap/__init__.py
@@ -2,7 +2,7 @@ __all__ = ['OfflineImap']
 
 __productname__ = 'OfflineIMAP'
 __version__     = "6.6.0"
-__revision__    = "-rc3"
+__revision__    = ""
 __bigversion__  = __version__ + __revision__
 __copyright__   = "Copyright 2002-2015 John Goerzen & contributors"
 __author__      = "John Goerzen"