diff --git a/vagrant.gemspec b/vagrant.gemspec
index f0df4af6a..064a46c5b 100644
--- a/vagrant.gemspec
+++ b/vagrant.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "minitest", "~> 2.5.1"
   s.add_development_dependency "mocha"
   s.add_development_dependency "childprocess", "~> 0.2.2"
-  s.add_development_dependency "sys-proctable", "~> 0.9.1"
+  s.add_development_dependency "sys-proctable", "~> 0.9.0"
   s.add_development_dependency "rspec-core", "~> 2.7.1"
   s.add_development_dependency "rspec-expectations", "~> 2.7.0"
   s.add_development_dependency "rspec-mocks", "~> 2.7.0"