diff --git a/tempest/values.yaml b/tempest/values.yaml
index a930f75d73..f88a16880d 100644
--- a/tempest/values.yaml
+++ b/tempest/values.yaml
@@ -122,22 +122,22 @@ conf:
   tempest:
     auth:
       # admin_username value set by configmap-etc
-      admin_username: None
+      admin_username: null
       # admin_password value set by configmap-etc
-      admin_password: None
+      admin_password: null
       # admin_project_name value set by configmap-etc
-      admin_project_name: None
+      admin_project_name: null
       # admin_domain_name value set by configmap-etc
-      admin_domain_name: None
+      admin_domain_name: null
       use_dynamic_credentials: true
       tempest_roles: admin, member
     identity:
       admin_domain_scope: true
       auth_version: v3
       # region value set by configmap-etc
-      region: None
+      region: null
       # uri_v3 value set by configmap-etc
-      uri_v3: None
+      uri_v3: null
     identity-feature-enabled:
       api_v2: false
       api_v3: true