diff --git a/widget_periodictable/_version.py b/widget_periodictable/_version.py
index 198bd17..4792625 100644
--- a/widget_periodictable/_version.py
+++ b/widget_periodictable/_version.py
@@ -4,5 +4,5 @@
 # Copyright (c) Dou Du.
 # Distributed under the terms of the Modified BSD License.
 
-version_info = (3, 0, 0, 'dev')
+version_info = (3, 0, 0)
 __version__ = ".".join(map(str, version_info))