diff --git a/lib/optparse.rb b/lib/optparse.rb
index 0998251fbf..832b928a2d 100644
--- a/lib/optparse.rb
+++ b/lib/optparse.rb
@@ -425,7 +425,7 @@
 # If you have any questions, file a ticket at http://bugs.ruby-lang.org.
 #
 class OptionParser
-  OptionParser::Version = "0.4.0.pre.1"
+  OptionParser::Version = "0.4.0"
 
   # :stopdoc:
   NoArgument = [NO_ARGUMENT = :NONE, nil].freeze