diff --git a/lib/rspec/version.rb b/lib/rspec/version.rb
index 403f5f4d..75ba9c43 100644
--- a/lib/rspec/version.rb
+++ b/lib/rspec/version.rb
@@ -1,5 +1,5 @@
 module RSpec # :nodoc:
   module Version # :nodoc:
-    STRING = '3.12.0.pre'
+    STRING = '3.13.0.pre'
   end
 end