diff --git a/lib/set/set.gemspec b/lib/set/set.gemspec
index 7ff8767b93..0def52e859 100644
--- a/lib/set/set.gemspec
+++ b/lib/set/set.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "set"
-  spec.version       = "1.0.3.dev"
+  spec.version       = "1.0.3"
   spec.authors       = ["Akinori MUSHA"]
   spec.email         = ["knu@idaemons.org"]