diff --git a/butterfree/migrations/database_migration/cassandra_migration.py b/butterfree/migrations/database_migration/cassandra_migration.py
index deef6cf5..9b804721 100644
--- a/butterfree/migrations/database_migration/cassandra_migration.py
+++ b/butterfree/migrations/database_migration/cassandra_migration.py
@@ -86,6 +86,7 @@ def _get_alter_column_type_query(self, column: Diff, table_name: str) -> str:
             Alter column type query.
 
         """
+
     def _get_alter_column_type_query(self, column: Diff, table_name: str) -> str:
         """Creates CQL statement to alter columns' types.
             In Cassandra 3.4.x to 3.11.x alter type is not allowed.
@@ -102,15 +103,20 @@ def _get_alter_column_type_query(self, column: Diff, table_name: str) -> str:
 
         temp_column_name = f"{column.column}_temp"
 
-        add_temp_column_query = f"ALTER TABLE {table_name} ADD {temp_column_name} {column.value};"
-        copy_data_to_temp_query = f"UPDATE {table_name} SET {temp_column_name} = {column.column};"
+        add_temp_column_query = (
+            f"ALTER TABLE {table_name} ADD {temp_column_name} {column.value};"
+        )
+        copy_data_to_temp_query = (
+            f"UPDATE {table_name} SET {temp_column_name} = {column.column};"
+        )
 
         drop_old_column_query = f"ALTER TABLE {table_name} DROP {column.column};"
-        rename_temp_column_query = f"ALTER TABLE {table_name} RENAME {temp_column_name} TO {column.column};"
+        rename_temp_column_query = (
+            f"ALTER TABLE {table_name} RENAME {temp_column_name} TO {column.column};"
+        )
 
         return f"{add_temp_column_query} {copy_data_to_temp_query} {drop_old_column_query} {rename_temp_column_query};"
 
-
     @staticmethod
     def _get_create_table_query(columns: List[Dict[str, Any]], table_name: str) -> str:
         """Creates CQL statement to create a table.