diff --git a/ext/readline/readline-ext.gemspec b/ext/readline/readline-ext.gemspec
index 4d4d4b2dd9..a611a8ea9a 100644
--- a/ext/readline/readline-ext.gemspec
+++ b/ext/readline/readline-ext.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "readline-ext"
-  spec.version       = "0.1.0.pre.1"
+  spec.version       = "0.1.0"
   spec.authors       = ["Yukihiro Matsumoto"]
   spec.email         = ["matz@ruby-lang.org"]