diff --git a/Rakefile b/Rakefile
index cce95a1ae..c5c664a02 100644
--- a/Rakefile
+++ b/Rakefile
@@ -10,11 +10,12 @@ begin
     gemspec.homepage = "http://github.com/mitchellh/vagrant"
     gemspec.authors = ["Mitchell Hashimoto", "John Bender"]
 
-    gemspec.add_dependency('virtualbox', '>= 0.4.3')
+    gemspec.add_dependency('virtualbox', '>= 0.5.0')
     gemspec.add_dependency('net-ssh', '>= 2.0.19')
     gemspec.add_dependency('net-scp', '>= 1.0.2')
     gemspec.add_dependency('json', '>= 1.2.0')
     gemspec.add_dependency('jashmenn-git-style-binaries', '>= 0.1.10')
+    gemspec.add_dependency('tarruby', '>= 0.1.5')
   end
   Jeweler::GemcutterTasks.new
 rescue LoadError