diff --git a/setup.py b/setup.py
index 5923569fc523bfe102f26afb65d05a367577c49f..8dedba34dfcd6ec41394b1f61f895ed98d98ad23 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,8 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name='csst_ifs_sim',
-    version='0.7.02',
+    # Internal_Version = '0.7.02',
+    version='2.0.0-IFS1.0.0',
     author='CSST Team',
     author_email='zhaojunyan@shao.ac.cn',
     description='The CSST - ifs - sim',  # short description