diff --git a/aepsych/version.py b/aepsych/version.py
index 42b2709e2..cf3e543ae 100644
--- a/aepsych/version.py
+++ b/aepsych/version.py
@@ -5,4 +5,4 @@
 # This source code is licensed under the license found in the
 # LICENSE file in the root directory of this source tree.
 
-__version__ = "0.4.0dev"
+__version__ = "0.4.0"