diff --git a/HISTORY.rst b/HISTORY.rst
index 5b787767..7fd48653 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -4,7 +4,7 @@ Release Notes
 PlatformIO 3.0
 --------------
 
-3.1.0 (2016-09-??)
+3.1.0 (2016-09-19)
 ~~~~~~~~~~~~~~~~~~
 
 * New! Dynamic variables/templates for `Project Configuration File "platformio.ini" <http://docs.platformio.org/en/stable/projectconf.html>`__
diff --git a/platformio/__init__.py b/platformio/__init__.py
index 3757f355..476cae5d 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (3, 1, "0a5")
+VERSION = (3, 1, 0)
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"