diff --git a/io-wait.gemspec b/io-wait.gemspec
index 3ba8a0b..a9d60ee 100644
--- a/io-wait.gemspec
+++ b/io-wait.gemspec
@@ -1,4 +1,4 @@
-_VERSION = "0.4.0"
+_VERSION = "1.0.0"
 
 Gem::Specification.new do |spec|
   spec.name          = "io-wait"