diff --git a/twspace_dl/__main__.py b/twspace_dl/__main__.py
index 037dd79..f748207 100644
--- a/twspace_dl/__main__.py
+++ b/twspace_dl/__main__.py
@@ -6,7 +6,7 @@
 import shutil
 import sys
 
-from twspace_dl.TwspaceDL import TwspaceDL
+from twspace_dl.twspace_dl import TwspaceDL
 
 
 def get_args() -> argparse.Namespace:
diff --git a/twspace_dl/FormatInfo.py b/twspace_dl/format_info.py
similarity index 100%
rename from twspace_dl/FormatInfo.py
rename to twspace_dl/format_info.py
diff --git a/twspace_dl/Login.py b/twspace_dl/login.py
similarity index 100%
rename from twspace_dl/Login.py
rename to twspace_dl/login.py
diff --git a/twspace_dl/TwspaceDL.py b/twspace_dl/twspace_dl.py
similarity index 99%
rename from twspace_dl/TwspaceDL.py
rename to twspace_dl/twspace_dl.py
index 75e0bea..36c2d61 100644
--- a/twspace_dl/TwspaceDL.py
+++ b/twspace_dl/twspace_dl.py
@@ -12,8 +12,8 @@
 
 import requests
 
-from .FormatInfo import FormatInfo
-from .Login import Login
+from .format_info import FormatInfo
+from .login import Login
 
 
 class TwspaceDL: