diff --git a/calliope/_version.py b/calliope/_version.py
index f0ca8cfe7..abeeedbf5 100644
--- a/calliope/_version.py
+++ b/calliope/_version.py
@@ -1 +1 @@
-__version__ = '0.4.0-dev'
+__version__ = '0.4.0'
diff --git a/changelog.rst b/changelog.rst
index be57fe788..6e9436a62 100644
--- a/changelog.rst
+++ b/changelog.rst
@@ -3,8 +3,8 @@
 Release History
 ===============
 
-0.4.0 (dev)
------------
+0.4.0 (2016-12-09)
+------------------
 
 Major changes
 ~~~~~~~~~~~~~
@@ -21,7 +21,7 @@ Other changes
 ~~~~~~~~~~~~~
 
 * |new| Functionality to post-process parallel runs into aggregated NetCDF files in ``calliope.read``
-* |changed| Pandas 0.18.0 compatibility
+* |changed| Pandas 0.18/0.19 compatibility
 * |changed| 1.11 is now the minimum required numpy version. This version makes datetime64 tz-naive by default, thus preventing some odd behavior when displaying time series.
 * |changed| Improved logging, status messages, and error reporting
 * |fixed| Other minor fixes