diff --git a/versions.cfg b/versions.cfg
index 5d8533a..925815c 100644
--- a/versions.cfg
+++ b/versions.cfg
@@ -1,3 +1,3 @@
 [versions]
 plone.app.locales = 4.3.1
-zc.buildout = 2.1.0
+zc.buildout = 1.7.1