diff --git a/lib/nokogiri/version.rb b/lib/nokogiri/version.rb
index 2802ef71727..f7f88af58aa 100644
--- a/lib/nokogiri/version.rb
+++ b/lib/nokogiri/version.rb
@@ -1,6 +1,6 @@
 module Nokogiri
   # The version of Nokogiri you are using
-  VERSION = '1.5.0'
+  VERSION = '1.5.1.rc1'
 
   class VersionInfo # :nodoc:
     def jruby?