diff --git a/HISTORY.rst b/HISTORY.rst
index fb8f8747..a2e01ada 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -4,6 +4,9 @@ Release Notes
 PlatformIO 3.0
 --------------
 
+3.6.5 (2019-??-??)
+~~~~~~~~~~~~~~~~~~
+
 3.6.4 (2019-01-23)
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/platformio/__init__.py b/platformio/__init__.py
index bb0d7626..d445d6c4 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (3, 6, 4)
+VERSION = (3, 6, "5a1")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"