diff --git a/zerver/lib/event_schema.py b/zerver/lib/event_schema.py
index 7c32d8238f..9df86fbf50 100644
--- a/zerver/lib/event_schema.py
+++ b/zerver/lib/event_schema.py
@@ -873,7 +873,7 @@ def check_realm_update(
         assert "extra_data" in event
         return
 
-    assert "extra_data" not in event.keys()
+    assert "extra_data" not in event
 
     if prop in ["notifications_stream_id", "signup_notifications_stream_id", "org_type"]:
         assert isinstance(value, int)
@@ -1474,7 +1474,7 @@ def check_update_display_settings(
     if setting_name == "default_language":
         assert "language_name" in event
     else:
-        assert "language_name" not in event.keys()
+        assert "language_name" not in event
 
 
 def check_user_settings_update(
@@ -1495,7 +1495,7 @@ def check_user_settings_update(
     if setting_name == "default_language":
         assert "language_name" in event
     else:
-        assert "language_name" not in event.keys()
+        assert "language_name" not in event
 
 
 update_global_notifications_event = event_dict_type(
diff --git a/zerver/lib/external_accounts.py b/zerver/lib/external_accounts.py
index 94f25bc831..2bd0777950 100644
--- a/zerver/lib/external_accounts.py
+++ b/zerver/lib/external_accounts.py
@@ -65,9 +65,9 @@ def validate_external_account_field_data(field_data: ProfileFieldData) -> Profil
     field_validator("field_data", field_data)
 
     field_subtype = field_data.get("subtype")
-    if field_subtype not in DEFAULT_EXTERNAL_ACCOUNTS.keys():
+    if field_subtype not in DEFAULT_EXTERNAL_ACCOUNTS:
         if field_subtype == "custom":
-            if "url_pattern" not in field_data.keys():
+            if "url_pattern" not in field_data:
                 raise ValidationError(_("Custom external account must define URL pattern"))
         else:
             raise ValidationError(_("Invalid external account type"))
diff --git a/zerver/openapi/openapi.py b/zerver/openapi/openapi.py
index d431f5f6eb..787ccbf448 100644
--- a/zerver/openapi/openapi.py
+++ b/zerver/openapi/openapi.py
@@ -398,7 +398,7 @@ def validate_against_openapi_schema(
     # No 500 responses have been documented, so skip them
     if status_code.startswith("5"):
         return False
-    if path not in openapi_spec.openapi()["paths"].keys():
+    if path not in openapi_spec.openapi()["paths"]:
         endpoint = find_openapi_endpoint(path)
         # If it doesn't match it hasn't been documented yet.
         if endpoint is None:
diff --git a/zerver/webhooks/opbeat/view.py b/zerver/webhooks/opbeat/view.py
index cf45f54f74..6d2e565af1 100644
--- a/zerver/webhooks/opbeat/view.py
+++ b/zerver/webhooks/opbeat/view.py
@@ -62,7 +62,7 @@ def format_object(
     subject_type: str,
     message: str,
 ) -> str:
-    if subject_type not in subject_types.keys():
+    if subject_type not in subject_types:
         return message
     keys: List[List[str]] = subject_types[subject_type][1:]
     title = subject_types[subject_type][0]