diff --git a/ocdskit/commands/schema_report.py b/ocdskit/commands/schema_report.py
index ab3cf9c..12ccaba 100644
--- a/ocdskit/commands/schema_report.py
+++ b/ocdskit/commands/schema_report.py
@@ -54,7 +54,7 @@ def recurse(data):
                     # Find definitions that can use a common $ref in the versioned release schema. Unversioned fields,
                     # like the `id`'s of objects in arrays that are not `wholeListMerge`, should be excluded, but it's
                     # too much work with too little advantage to do so.
-                    if key in ('definitions', 'properties'):
+                    if key in {'definitions', 'properties'}:
                         for definition in value.values():
                             add_definition(definition)
                     recurse(value)
diff --git a/ocdskit/util.py b/ocdskit/util.py
index a30365e..097476c 100644
--- a/ocdskit/util.py
+++ b/ocdskit/util.py
@@ -234,7 +234,7 @@ def detect_format(path, root_path='', reader=open):
                     is_compiled = True
             elif prefix in metadata_prefixes:
                 metadata_count += 1
-            if not prefix and event not in ('end_array', 'end_map', 'map_key'):
+            if not prefix and event not in {'end_array', 'end_map', 'map_key'}:
                 return _detect_format_result(
                     True, is_array, has_records, has_releases, has_ocid, has_tag, is_compiled, metadata_count  # noqa: FBT003
                 )