diff --git a/covsirphy/__version__.py b/covsirphy/__version__.py
index 481166817..d366471c0 100644
--- a/covsirphy/__version__.py
+++ b/covsirphy/__version__.py
@@ -1,4 +1,4 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-__version__ = "2.10.0-rho.new.269.319.322.330.335.fix.291.307.309.328"
+__version__ = "2.10.0-sigma.new.269.319.322.330.335.fix.291.307.309.328"