diff --git a/lib/constants.py b/lib/constants.py
index f720fd535c10b1c169f498c2f11e58f6fe4a73d5..c0b90cf8f293fe360c22652368df97d940dc112c 100644
--- a/lib/constants.py
+++ b/lib/constants.py
@@ -26,7 +26,7 @@ import re
 from ganeti import _autoconf
 
 # various versions
-PROTOCOL_VERSION = 30
+PROTOCOL_VERSION = 40
 RELEASE_VERSION = _autoconf.PACKAGE_VERSION
 OS_API_V10 = 10
 OS_API_V15 = 15