diff --git a/ext/io/nonblock/io-nonblock.gemspec b/ext/io/nonblock/io-nonblock.gemspec
index b0fc662fac..4f5b8cef6f 100644
--- a/ext/io/nonblock/io-nonblock.gemspec
+++ b/ext/io/nonblock/io-nonblock.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "io-nonblock"
-  spec.version       = "0.3.1"
+  spec.version       = "0.3.2"
   spec.authors       = ["Nobu Nakada"]
   spec.email         = ["nobu@ruby-lang.org"]