diff --git a/plugins/inventory/openstack.py b/plugins/inventory/openstack.py
index 064ada9d..ebcf38ff 100644
--- a/plugins/inventory/openstack.py
+++ b/plugins/inventory/openstack.py
@@ -11,8 +11,6 @@ DOCUMENTATION = '''
 name: openstack
 author: OpenStack Ansible SIG
 short_description: OpenStack inventory source
-requirements:
-    - "openstacksdk >= 0.28"
 description:
     - Get inventory hosts from OpenStack clouds
     - Uses openstack.(yml|yaml) YAML configuration file to configure the inventory plugin
@@ -110,7 +108,9 @@ options:
         description: Automatically create groups from host variables.
         type: bool
         default: true
-
+requirements:
+    - "python >= 3.6"
+    - "openstacksdk >= 0.28, < 0.99.0"
 extends_documentation_fragment:
 - inventory_cache
 - constructed