diff --git a/constraints.txt b/constraints.txt
index 4f1f7ced2f..3f59fa97f4 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -43,5 +43,5 @@ tornado==4.5.3
 typing_extensions==4.14.0
 urllib3==2.5.0
 Werkzeug==0.16.1
-zope.event==5.1
+zope.event==6.0
 zope.interface==7.2