diff --git a/notebook/_version.py b/notebook/_version.py
index 2eb55ccbf..32e2a17fb 100644
--- a/notebook/_version.py
+++ b/notebook/_version.py
@@ -1,2 +1,2 @@
-version_info = (4, 0, 0, 'dev')
+version_info = (4, 0, 0)
 __version__ = '.'.join(map(str, version_info))