diff --git a/ironic/api/controllers/v1/node.py b/ironic/api/controllers/v1/node.py
index ece70cd164..f9c651ca92 100644
--- a/ironic/api/controllers/v1/node.py
+++ b/ironic/api/controllers/v1/node.py
@@ -1278,7 +1278,7 @@ def _check_steps(steps, step_type, schema):
     for step in steps:
         eocn = step.get('execute_on_child_nodes')
         child_nodes = step.get('limit_child_node_execution')
-        if eocn and type(child_nodes) == list:
+        if eocn and isinstance(child_nodes, list):
             # Extract each element, validate permission to access node.
             for entry in child_nodes:
                 if not uuidutils.is_uuid_like(entry):
diff --git a/tox.ini b/tox.ini
index 09a96b957e..64974e4378 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,12 +41,12 @@ commands = {toxinidir}/tools/states_to_dot.py -f {toxinidir}/doc/source/images/s
 [testenv:pep8]
 usedevelop = False
 deps=
-    hacking~=6.0.0 # Apache-2.0
-    doc8>=0.6.0 # Apache-2.0
+    hacking~=6.1.0 # Apache-2.0
+    doc8~=1.1.0 # Apache-2.0
     pycodestyle>=2.0.0,<3.0.0 # MIT
-    flake8-import-order>=0.17.1 # LGPLv3
-    Pygments>=2.2.0 # BSD
-    bashate>=0.5.1 # Apache-2.0
+    flake8-import-order~=0.18.0 # LGPLv3
+    Pygments~=2.17.0 # BSD
+    bashate~=2.1.0 # Apache-2.0
 allowlist_externals = bash
                       {toxinidir}/tools/run_bashate.sh
                       {toxinidir}/tools/check-releasenotes.py