diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6cc42fe8e..d16298330 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.6.4 (unreleased)
+
+
+
 ## 1.6.3 (May 29, 2014)
 
 FEATURES:
diff --git a/version.txt b/version.txt
index 266146b87..a731447da 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.6.3
+1.6.4.dev