diff --git a/lib/fluent/version.rb b/lib/fluent/version.rb
index 8ad30e5ab8..b498a6e20d 100644
--- a/lib/fluent/version.rb
+++ b/lib/fluent/version.rb
@@ -16,6 +16,6 @@
 
 module Fluent
 
-  VERSION = '1.1.3'
+  VERSION = '1.2.0.pre1'
 
 end