diff --git a/lib/nio/version.rb b/lib/nio/version.rb
index b0240e5..0a2e073 100644
--- a/lib/nio/version.rb
+++ b/lib/nio/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module NIO
-  VERSION = "1.2.1".freeze
+  VERSION = "2.0.0.pre".freeze
 end