diff --git a/pyiceberg/catalog/dynamodb.py b/pyiceberg/catalog/dynamodb.py
index 220313ab74..62a4da5108 100644
--- a/pyiceberg/catalog/dynamodb.py
+++ b/pyiceberg/catalog/dynamodb.py
@@ -704,7 +704,7 @@ def _convert_dynamo_table_item_to_iceberg_table(self, dynamo_table_item: dict[st
             DYNAMODB_COL_NAMESPACE,
             DYNAMODB_COL_CREATED_AT,
         ]:
-            if prop not in table_dict.keys():
+            if prop not in table_dict:
                 raise NoSuchPropertyException(f"Iceberg required property {prop} is missing: {dynamo_table_item}")
 
         table_type = table_dict[_add_property_prefix(TABLE_TYPE)]
diff --git a/pyiceberg/table/update/snapshot.py b/pyiceberg/table/update/snapshot.py
index 8feebb9901..5ca3eb7a73 100644
--- a/pyiceberg/table/update/snapshot.py
+++ b/pyiceberg/table/update/snapshot.py
@@ -1008,7 +1008,7 @@ def merge_manifests(self, manifests: list[ManifestFile]) -> list[ManifestFile]:
         groups = self._group_by_spec(manifests)
 
         merged_manifests = []
-        for spec_id in reversed(groups.keys()):
+        for spec_id in reversed(groups):
             merged_manifests.extend(self._merge_group(first_manifest, spec_id, groups[spec_id]))
 
         return merged_manifests