diff --git a/aerich/ddl/postgres/__init__.py b/aerich/ddl/postgres/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/aerich/ddl/sqlite/__init__.py b/aerich/ddl/sqlite/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/setup.py b/setup.py
index 5ae806f..1452c96 100644
--- a/setup.py
+++ b/setup.py
@@ -39,6 +39,6 @@ setup(
     keywords=(
         'migrate Tortoise-ORM mysql'
     ),
-    dependency_links=['https://github.com/tortoise/tortoise-orm.git@branch#egg=tortoise-orm'],
+    dependency_links=['https://github.com/tortoise/tortoise-orm.git@develop#egg=tortoise-orm'],
     install_requires=requirements(),
 )