diff --git a/vulnerabilities/tests/pipelines/test_pipeline_id.py b/vulnerabilities/tests/pipelines/test_pipeline_id.py
index 6eb1e1008..17bf2b09d 100644
--- a/vulnerabilities/tests/pipelines/test_pipeline_id.py
+++ b/vulnerabilities/tests/pipelines/test_pipeline_id.py
@@ -53,7 +53,7 @@ def test_no_empty_pipeline_ids(self):
             assert False, error_message
 
     def test_no_none_pipeline_ids(self):
-        none_pipeline_ids = [cls for cls, pid in self.pipeline_dict.items() if pid == None]
+        none_pipeline_ids = [cls for cls, pid in self.pipeline_dict.items() if pid is None]
 
         if none_pipeline_ids:
             error_messages = [f"{cls.__name__} has None pipeline_id." for cls in none_pipeline_ids]
diff --git a/vulnerabilities/tests/pipelines/v2_importers/test_xen_importer_v2.py b/vulnerabilities/tests/pipelines/v2_importers/test_xen_importer_v2.py
index f5813896e..36b23d23f 100644
--- a/vulnerabilities/tests/pipelines/v2_importers/test_xen_importer_v2.py
+++ b/vulnerabilities/tests/pipelines/v2_importers/test_xen_importer_v2.py
@@ -99,4 +99,4 @@ def test_to_advisories_missing_fields(pipeline):
 
     assert advisory.advisory_id == "XSA-None"
     assert advisory.aliases == []
-    assert advisory.summary == None
+    assert advisory.summary is None
diff --git a/vulnerabilities/tests/test_improve_runner.py b/vulnerabilities/tests/test_improve_runner.py
index 682b45f19..6fb5030ca 100644
--- a/vulnerabilities/tests/test_improve_runner.py
+++ b/vulnerabilities/tests/test_improve_runner.py
@@ -182,7 +182,6 @@ def get_objects_in_all_tables_used_by_process_inferences():
         "references": list(VulnerabilityReference.objects.all()),
         "advisories": list(Advisory.objects.all()),
         "packages": list(Package.objects.all()),
-        "references": list(VulnerabilityReference.objects.all()),
         "severity": list(VulnerabilitySeverity.objects.all()),
     }
 
@@ -207,7 +206,7 @@ def test_process_inference_idempotency_with_different_improver_names():
 
 @pytest.mark.django_db
 def test_get_or_created_vulnerability_and_aliases_with_empty_aliases():
-    assert get_or_create_vulnerability_and_aliases(aliases=[], summary="EMPTY ALIASES") == None
+    assert get_or_create_vulnerability_and_aliases(aliases=[], summary="EMPTY ALIASES") is None
 
 
 @pytest.mark.django_db