diff --git a/url_canonicalize.gemspec b/url_canonicalize.gemspec
index cc4c19a..c81c85e 100755
--- a/url_canonicalize.gemspec
+++ b/url_canonicalize.gemspec
@@ -24,5 +24,5 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
 
   s.add_dependency 'addressable', '~> 2' # To normalize URLs
-  s.add_dependency 'nokogiri', '>= 1.6.8' # To look for <link rel="canonical" ...> in HTML
+  s.add_dependency 'nokogiri', '>= 1.8.2' # To look for <link rel="canonical" ...> in HTML
 end