diff --git a/stackinator/__init__.py b/stackinator/__init__.py
index a65d7e7..730bcf7 100644
--- a/stackinator/__init__.py
+++ b/stackinator/__init__.py
@@ -1,7 +1,7 @@
 import logging
 import re
 
-VERSION = "3.1-dev"
+VERSION = "4.0"
 root_logger = logging.getLogger("stackinator")
 
 stackinator_version_info = tuple(re.split(r"\.|-", VERSION))