diff --git a/Gemfile b/Gemfile
index 63be91bc4..9018dc64f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,10 +1,10 @@
 source :gemcutter
 
 # Gems required for the lib to even run
-gem "virtualbox", "~> 0.6.1"
+gem "virtualbox", :git => "git://github.com/mitchellh/virtualbox.git"
 gem "net-ssh", ">= 2.0.19"
 gem "net-scp", ">= 1.0.2"
-gem "json_pure", ">= 1.2.0"
+gem "json", ">= 1.2.4"
 gem "archive-tar-minitar", "= 0.5.2"
 gem "mario", "~> 0.0.6"
 
diff --git a/lib/vagrant/config.rb b/lib/vagrant/config.rb
index 78e8bccfe..ab087e436 100644
--- a/lib/vagrant/config.rb
+++ b/lib/vagrant/config.rb
@@ -45,8 +45,8 @@ module Vagrant
         send(key)
       end
 
-      def to_json
-        instance_variables_hash.to_json
+      def to_json(*a)
+        instance_variables_hash.to_json(*a)
       end
 
       def instance_variables_hash
diff --git a/lib/vagrant/provisioners/chef.rb b/lib/vagrant/provisioners/chef.rb
index 35ba58d43..b6d27e309 100644
--- a/lib/vagrant/provisioners/chef.rb
+++ b/lib/vagrant/provisioners/chef.rb
@@ -59,12 +59,12 @@ module Vagrant
           run_list << name
         end
 
-        def to_json
+        def to_json(*a)
           # Overridden so that the 'json' key could be removed, since its just
           # merged into the config anyways
           data = instance_variables_hash
           data.delete(:json)
-          data.to_json
+          data.to_json(*a)
         end
       end