diff --git a/requirements.txt b/requirements.txt
index 8935d351..9d5f8fcc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 setuptools<80.3
 urllib3<2.4
-zc.buildout==3.3
+zc.buildout==5.1.1
 zope.interface==6.4.post2