diff --git a/impressionist.gemspec b/impressionist.gemspec
index d485199..5c1747d 100644
--- a/impressionist.gemspec
+++ b/impressionist.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'httpclient', '~> 2.2'
 
-  s.add_dependency 'nokogiri', '~> 1.5.0'
+  s.add_dependency 'nokogiri', '=> 1.5.0'
 
   s.add_development_dependency 'capybara', '>= 2.0.3'
   s.add_development_dependency 'rake', '>= 0.9'