diff --git a/HISTORY.rst b/HISTORY.rst
index a4b11b36..ae4961ea 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -4,7 +4,7 @@ Release Notes
 PlatformIO 2.0
 --------------
 
-2.9.1 (2016-04-??)
+2.9.1 (2016-04-30)
 ~~~~~~~~~~~~~~~~~~
 
 * Handle prototype pointers while converting ``*.ino`` to ``.cpp``
diff --git a/platformio/__init__.py b/platformio/__init__.py
index b770a33d..0f6724ec 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (2, 9, "1.dev0")
+VERSION = (2, 9, 1)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"