diff --git a/ext/io/wait/io-wait.gemspec b/ext/io/wait/io-wait.gemspec
index 5150f14848..ec7c05dd87 100644
--- a/ext/io/wait/io-wait.gemspec
+++ b/ext/io/wait/io-wait.gemspec
@@ -1,4 +1,4 @@
-_VERSION = "0.2.0"
+_VERSION = "0.2.1"
 
 Gem::Specification.new do |spec|
   spec.name          = "io-wait"