diff --git a/tempest/cli/simple_read_only/heat_templates/heat_minimal_hot.yaml b/tempest/cli/simple_read_only/heat_templates/heat_minimal_hot.yaml
index 6d89b7b..4657bfc 100644
--- a/tempest/cli/simple_read_only/heat_templates/heat_minimal_hot.yaml
+++ b/tempest/cli/simple_read_only/heat_templates/heat_minimal_hot.yaml
@@ -3,10 +3,10 @@
 parameters:
   instance_image:
     description: Glance image name
-    type: String
+    type: string
   instance_type:
     description: Nova instance type
-    type: String
+    type: string
     default: m1.small
     constraints:
         - allowed_values: [m1.small, m1.medium, m1.large]