diff --git a/setup.py b/setup.py
index 84c12698eb53e8e5f82ea89787061a61f5de6687..7b314b0666fa77782513cb0051b9de62f880c856 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name='csst_mci_sim',
-    version='2.0.0-MCI1.0.0',
+    version='1.0.0',
     author='CSST Team',
     author_email='zhaojunyan@shao.ac.cn',
     description='The CSST - mci - sim',  # short description