diff --git a/README.md b/README.md
index 71e025c..7c38639 100644
--- a/README.md
+++ b/README.md
@@ -1100,6 +1100,11 @@ Example Usage:
 
 3.x Changelog
 -------------
+3.6.6 - 24 September 2018
+
+    * Bugfix: When printing records, handle an improper list correctly. #478
+    * Bugfix: Fix various tests and make some rotation code more explicit. #476
+    * Bugfix: Make sure not to miscount messages during high-water mark check. #475
 
 3.6.5 - 3 September 2018
 
diff --git a/src/lager.app.src b/src/lager.app.src
index e510345..ded32b2 100644
--- a/src/lager.app.src
+++ b/src/lager.app.src
@@ -3,7 +3,7 @@
 {application, lager,
  [
   {description, "Erlang logging framework"},
-  {vsn, "3.6.5"},
+  {vsn, "3.6.6"},
   {modules, []},
   {applications, [
                   kernel,