diff --git a/bitbake/lib/bb/ui/hob.py b/bitbake/lib/bb/ui/hob.py
index 1321ebb..61df300 100755
--- a/bitbake/lib/bb/ui/hob.py
+++ b/bitbake/lib/bb/ui/hob.py
@@ -29,7 +29,7 @@ try:
     import pygtk
     pygtk.require('2.0') # to be certain we don't have gtk+ 1.x !?!
     ver = gtk.pygtk_version
-    if ver  < (2, 22, 0):
+    if ver  < (2, 21, 0):
         sys.exit("%s (you have pygtk %s.%s.%s)." % (requirements, ver[0], ver[1], ver[2]))
 except ImportError as exc:
     sys.exit("%s (%s)." % (requirements, str(exc)))