diff --git a/lib/tmpdir.gemspec b/lib/tmpdir.gemspec
index 4c96e5984b..2755c74688 100644
--- a/lib/tmpdir.gemspec
+++ b/lib/tmpdir.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "tmpdir"
-  spec.version       = "0.2.0"
+  spec.version       = "0.3.0"
   spec.authors       = ["Yukihiro Matsumoto"]
   spec.email         = ["matz@ruby-lang.org"]