diff --git a/vagrant-libvirt.gemspec b/vagrant-libvirt.gemspec
index 83005c1..c513c6f 100644
--- a/vagrant-libvirt.gemspec
+++ b/vagrant-libvirt.gemspec
@@ -25,27 +25,27 @@ Gem::Specification.new do |s|
       s.add_development_dependency(%q<rspec-core>, ["~> 2.12.2"])
       s.add_development_dependency(%q<rspec-expectations>, ["~> 2.12.1"])
       s.add_development_dependency(%q<rspec-mocks>, ["~> 2.12.1"])
-      s.add_runtime_dependency(%q<fog>, ["~> 1.15"])
-      s.add_runtime_dependency(%q<ruby-libvirt>, ["~> 0.4"])
+      s.add_runtime_dependency(%q<fog>, [">= 1.22"])
+      s.add_runtime_dependency(%q<ruby-libvirt>, [">= 0.4.0"], ["< 0.6.0"])
       s.add_runtime_dependency(%q<nokogiri>, ["~> 1.6.0"])
       s.add_development_dependency(%q<rake>, [">= 0"])
     else
       s.add_dependency(%q<rspec-core>, ["~> 2.12.2"])
       s.add_dependency(%q<rspec-expectations>, ["~> 2.12.1"])
       s.add_dependency(%q<rspec-mocks>, ["~> 2.12.1"])
-      s.add_dependency(%q<fog>, ["~> 1.15"])
-      s.add_dependency(%q<ruby-libvirt>, ["~> 0.4"])
+      s.add_dependency(%q<fog>, [">= 1.22"])
+      s.add_dependency(%q<ruby-libvirt>, [">= 0.4.0"], ["< 0.6.0"])
       s.add_dependency(%q<nokogiri>, ["~> 1.6.0"])
       s.add_dependency(%q<rake>, [">= 0"])
     end
   else
     s.add_dependency(%q<rspec-core>, ["~> 2.12.2"])
     s.add_dependency(%q<rspec-expectations>, ["~> 2.12.1"])
     s.add_dependency(%q<rspec-mocks>, ["~> 2.12.1"])
-    s.add_dependency(%q<fog>, ["~> 1.15"])
-    s.add_dependency(%q<ruby-libvirt>, ["~> 0.4"])
+    s.add_dependency(%q<fog>, [">= 1.22"])
+    s.add_dependency(%q<ruby-libvirt>, [">= 0.4.0"], ["< 0.6.0"])
     s.add_dependency(%q<nokogiri>, ["~> 1.6.0"])
     s.add_dependency(%q<rake>, [">= 0"])
   end
 end

-- 
1.9.3