diff --git a/setup.py b/setup.py
index 38692037f..9d225e6ec 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-build_id = "308"  # may optionally include a ".{patchno}" suffix.
+build_id = "308.1"  # may optionally include a ".{patchno}" suffix.
 
 __doc__ = """This is a distutils setup-script for the pywin32 extensions.