diff --git a/setup.cfg b/setup.cfg
index 2d060f2186..b39b18c59f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -26,7 +26,7 @@ packages =
 
 [extras]
 ldap =
-  pyldap>=2.4 # PSF
+  pyldap>=2.4.20 # PSF
   ldappool>=2.0.0 # MPL
 memcache =
   python-memcached>=1.56 # PSF