diff --git a/README.md b/README.md
index 4abcbb1aa615f6f60889bba49136141c054e58af..36f58f974f08219e658a9a343eb055c5573f013a 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,10 @@ logger `tempsdb` to WARN will eliminate all warnings that tempsdb outputs.
 
 # Changelog
 
+## v0.6.4
+
+* _TBA_
+
 ## v0.6.3
 
 * added logging for opening and closing series
diff --git a/setup.cfg b/setup.cfg
index 8f3ac7704a66e01702ed37441994a771167332e8..6761a316d0150dabba509baebb2926fe87793511 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,7 @@
 # coding: utf-8
 [metadata]
 name = tempsdb
-version = 0.6.3
+version = 0.6.4a1
 long-description = file: README.md
 long-description-content-type = text/markdown; charset=UTF-8
 license_files = LICENSE