diff --git a/vagrant.gemspec b/vagrant.gemspec
index 0e25db8d3..68991b5ed 100644
--- a/vagrant.gemspec
+++ b/vagrant.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.add_dependency "childprocess", "~> 0.3.7"
   s.add_dependency "erubis", "~> 2.7.0"
   s.add_dependency "i18n", "~> 0.6.0"
-  s.add_dependency "json", "~> 1.6.6"
+  s.add_dependency "json", ">= 1.5.1", "< 1.8.0"
   s.add_dependency "log4r", "~> 1.1.9"
   s.add_dependency "net-ssh", "~> 2.2.2"
   s.add_dependency "net-scp", "~> 1.0.4"