diff --git a/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py b/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py
index a3cf76d..c1a1807 100644
--- a/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py
+++ b/keystone_tempest_plugin/tests/rbac/v3/test_policy_association.py
@@ -157,7 +157,7 @@ class IdentityV3RbacPolicyAssociationTests(rbac_base.IdentityV3RbacBaseTests,
         This test must check
           * whether the persona can delete a policy association for a region
             and service
-        """
+        """  # noqa: E501
         pass
 
 
diff --git a/keystone_tempest_plugin/tests/scenario/keycloak.py b/keystone_tempest_plugin/tests/scenario/keycloak.py
index 50c3495..ef2b01d 100644
--- a/keystone_tempest_plugin/tests/scenario/keycloak.py
+++ b/keystone_tempest_plugin/tests/scenario/keycloak.py
@@ -26,7 +26,7 @@ class KeycloakClient(object):
 
     @property
     def url_base(self):
-        return self.keycloak_url + f'/admin/realms'
+        return self.keycloak_url + '/admin/realms'
 
     @property
     def token_endpoint(self):
diff --git a/requirements.txt b/requirements.txt
index 67f303d..24faa8c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
+# Requirements lower bounds listed here are our best effort to keep them up to
+# date but we do not test them so no guarantee of having them all correct. If
+# you find any incorrect lower bounds, let us know or propose a fix.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 9c7d865..3d2e1c5 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
-
-hacking>=3.0,<3.1.0;python_version>='3.5' # Apache-2.0
+hacking>=6.1.0,<6.2.0 # Apache-2.0