diff --git a/setup.py b/setup.py
index 8dedba34dfcd6ec41394b1f61f895ed98d98ad23..cf6fbda09f7f05605574a8006923e92b197adf88 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@ with open("README.md", "r") as fh:
 setuptools.setup(
     name='csst_ifs_sim',
     # Internal_Version = '0.7.02',
-    version='2.0.0-IFS1.0.0',
+    version='1.0.0',
     author='CSST Team',
     author_email='zhaojunyan@shao.ac.cn',
     description='The CSST - ifs - sim',  # short description