diff --git a/ext/io/wait/io-wait.gemspec b/ext/io/wait/io-wait.gemspec
index 7b73d64200..ebc1f6f5c7 100644
--- a/ext/io/wait/io-wait.gemspec
+++ b/ext/io/wait/io-wait.gemspec
@@ -1,4 +1,4 @@
-_VERSION = "0.3.0.pre"
+_VERSION = "0.3.0"
 
 Gem::Specification.new do |spec|
   spec.name          = "io-wait"