diff --git a/contrib/post_test_hook.sh b/contrib/post_test_hook.sh
index 3961474..b864a9b 100644
--- a/contrib/post_test_hook.sh
+++ b/contrib/post_test_hook.sh
@@ -50,6 +50,7 @@
 # Set additional, necessary CONF values
 iniset $TEMPEST_CONFIG auth use_dynamic_credentials True
 iniset $TEMPEST_CONFIG auth tempest_roles Member
+iniset $TEMPEST_CONFIG identity auth_version v3
 
 # Give permissions back to Tempest.
 sudo chown -R tempest:stack $BASE/new/tempest