diff --git a/buildout.cfg b/buildout.cfg
index 8cc75a8..54a3870 100644
--- a/buildout.cfg
+++ b/buildout.cfg
@@ -36,7 +36,7 @@ Products.TemporaryFolder = < 4.0.dev0
 Products.ZCatalog = < 2.14.dev
 Products.ZCTextIndex = < 2.14.dev
 Record = < 2.14.dev
-RestrictedPython = < 4.1.dev
+RestrictedPython = < 3.7.dev
 tempstorage = < 2.13.dev
 transaction = < 1.2.dev
 zc.lockfile = < 1.1.dev