diff --git a/streampipes-client-python/setup.py b/streampipes-client-python/setup.py
index 9e9c2342e5..4682003545 100644
--- a/streampipes-client-python/setup.py
+++ b/streampipes-client-python/setup.py
@@ -50,7 +50,7 @@
     "autoflake==2.2.0",
     "black==23.7.0",
     "blacken-docs==1.15.0",
-    "flake8==6.0.0",
+    "flake8==6.1.0",
     "interrogate[png]==1.5.0",
     "isort==5.12.0",
     "mypy==1.4.0",
diff --git a/streampipes-client-python/streampipes/model/container/resource_container.py b/streampipes-client-python/streampipes/model/container/resource_container.py
index 27016896e1..c3a9746479 100644
--- a/streampipes-client-python/streampipes/model/container/resource_container.py
+++ b/streampipes-client-python/streampipes/model/container/resource_container.py
@@ -181,7 +181,7 @@ def from_json(cls, json_string: str) -> ResourceContainer:
 
         # the ResourceContainer expects a list of items
         # raise an exception if the response does not be a list
-        if not type(parsed_json) == list:
+        if not isinstance(parsed_json, list):
             raise StreamPipesResourceContainerJSONError(container_name=str(cls), json_string=json_string)
 
         try: