diff --git a/HISTORY.rst b/HISTORY.rst
index 0d239714..8ff024cb 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,8 +1,8 @@
 Release History
 ===============
 
-0.9.1 (?)
----------
+0.9.1 (2014-12-05)
+------------------
 
 * Ask user to install platform (when it hasn't been installed yet) within
   `platformio run <http://docs.platformio.ikravets.com/en/latest/userguide/cmd_run.html>`_
diff --git a/platformio/__init__.py b/platformio/__init__.py
index c52bc7fa..e2ae4fe1 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -1,7 +1,7 @@
 # Copyright (C) Ivan Kravets <me@ikravets.com>
 # See LICENSE for details.
 
-VERSION = (0, 10, "0-dev")
+VERSION = (0, 9, 1)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"