diff --git a/fog.gemspec b/fog.gemspec
index d889f50a1..2eee43226 100644
--- a/fog.gemspec
+++ b/fog.gemspec
@@ -53,7 +53,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency('rdoc')
   s.add_development_dependency('rspec', '~>1.3.1')
   s.add_development_dependency('shindo', '~>0.3.4')
-  s.add_development_dependency('virtualbox', '~>0.8.3')
+  s.add_development_dependency('virtualbox', '~>0.9.1')
 
   s.files = `git ls-files`.split("\n")
   s.test_files = `git ls-files -- {spec,tests}/*`.split("\n")