diff --git a/src/zope/password/password.py b/src/zope/password/password.py
index 8f9261c..4af8991 100644
--- a/src/zope/password/password.py
+++ b/src/zope/password/password.py
@@ -4,7 +4,7 @@
 # All Rights Reserved.
 #
 # This software is subject to the provisions of the Zope Public License,
-# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS