diff --git a/linebot/__about__.py b/linebot/__about__.py
index 5b9cd1e0..b8ea48d3 100644
--- a/linebot/__about__.py
+++ b/linebot/__about__.py
@@ -15,7 +15,7 @@
 """Meta data of line-bot-sdk."""
 
 
-__version__ = '1.0.0-test'
+__version__ = '1.0.0a1'
 __author__ = 'LINE Corporation'
 __copyright__ = 'Copyright 2016, LINE Corporation'
 __license__ = 'Apache 2.0'