diff --git a/Gemfile.lock b/Gemfile.lock
index c8e8c42..c743670 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,13 +20,17 @@ GEM
       ntlm-http (~> 0.1, >= 0.1.1)
       webrobots (~> 0.0, >= 0.0.9)
     mime-types (1.19)
+    mini_portile2 (2.5.1)
     mongrel (1.2.0.pre2)
       daemons (~> 1.0.10)
       gem_plugin (~> 0.2.3)
     net-http-digest_auth (1.2.1)
     net-http-persistent (2.8)
-    nokogiri (1.5.6)
+    nokogiri (1.11.4)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     ntlm-http (0.1.1)
+    racc (1.5.2)
     rake (10.0.3)
     rdoc (3.12)
       json (~> 1.4)
diff --git a/impostor.gemspec b/impostor.gemspec
index 942fc8e..d3e3d32 100644
--- a/impostor.gemspec
+++ b/impostor.gemspec
@@ -22,19 +22,19 @@ Gem::Specification.new do |s|
     s.specification_version = 3
 
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-      s.add_runtime_dependency(%q<nokogiri>, ["~> 1.4.0"])
+      s.add_runtime_dependency(%q<nokogiri>, ">= 1.4", "< 1.12")
       s.add_runtime_dependency(%q<mechanize>, ["~> 2.5.0"])
       s.add_development_dependency(%q<rdoc>, ["~> 3.10"])
       s.add_development_dependency(%q<hoe>, ["~> 2.14"])
       s.add_development_dependency(%q<vcr>)
     else
-      s.add_dependency(%q<nokogiri>, ["~> 1.4.0"])
+      s.add_dependency(%q<nokogiri>, ">= 1.4", "< 1.12")
       s.add_dependency(%q<mechanize>, ["~> 2.5.0"])
       s.add_dependency(%q<rdoc>, ["~> 3.10"])
       s.add_dependency(%q<hoe>, ["~> 2.14"])
     end
   else
-    s.add_dependency(%q<nokogiri>, ["~> 1.4.0"])
+    s.add_dependency(%q<nokogiri>, ">= 1.4", "< 1.12")
     s.add_dependency(%q<mechanize>, ["~> 2.5.0"])
     s.add_dependency(%q<rdoc>, ["~> 3.10"])
     s.add_dependency(%q<hoe>, ["~> 2.14"])