diff --git a/lib/tsort.gemspec b/lib/tsort.gemspec
index 4656d0b845..a82393b70b 100644
--- a/lib/tsort.gemspec
+++ b/lib/tsort.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "tsort"
-  spec.version       = "0.1.0"
+  spec.version       = "0.1.1"
   spec.authors       = ["Tanaka Akira"]
   spec.email         = ["akr@fsij.org"]