diff --git a/CHANGES.rst b/CHANGES.rst
index b0fe40acd..53f1f7267 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -19,8 +19,8 @@ Release history
    - Removed
    - Fixed
 
-0.4.0 (unreleased)
-==================
+0.4.0 (December 6, 2018)
+========================
 
 **Added**
 
diff --git a/nengo_loihi/version.py b/nengo_loihi/version.py
index ec29b3f45..ac41e4ae2 100644
--- a/nengo_loihi/version.py
+++ b/nengo_loihi/version.py
@@ -8,7 +8,7 @@
 
 name = "nengo_loihi"
 version_info = (0, 4, 0)  # (major, minor, patch)
-dev = 0
+dev = None
 
 version = "{v}{dev}".format(v='.'.join(str(v) for v in version_info),
                             dev=('.dev%d' % dev) if dev is not None else '')