diff --git a/Gemfile b/Gemfile
index 3774bee..c7ff7d2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "https://rubygems.org"
 
 gem "htmlentities", ">= 4.3.1"
 gem "curb", "~> 0.9.10"
-gem "nokogiri", "~> 1.9.1"
+gem "nokogiri", "~> 1.13.4"
 
 platforms :ruby_18 do
   # Needs libonig-dev debian/ubuntu package
diff --git a/Gemfile.lock b/Gemfile.lock
index ff88810..b3542e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,10 +4,11 @@ GEM
     curb (0.9.10)
     diff-lcs (1.1.3)
     htmlentities (4.3.4)
-    irb (1.0.0)
-    mini_portile2 (2.4.0)
-    nokogiri (1.9.1)
-      mini_portile2 (~> 2.4.0)
+    mini_portile2 (2.8.0)
+    nokogiri (1.13.4)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    racc (1.6.0)
     rake (10.5.0)
     rdoc (6.0.4)
     rspec (2.11.0)
@@ -25,8 +26,7 @@ PLATFORMS
 DEPENDENCIES
   curb (~> 0.9.10)
   htmlentities (>= 4.3.1)
-  irb
-  nokogiri (~> 1.9.1)
+  nokogiri (~> 1.13.4)
   rake (< 11.0)
   rdoc
   rspec (~> 2.11.0)
diff --git a/web-page-parser.gemspec b/web-page-parser.gemspec
index 24cc15f..cf11e5a 100644
--- a/web-page-parser.gemspec
+++ b/web-page-parser.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency("htmlentities", "~> 4.3")
   s.add_dependency("curb", "~> 0.9.10")
-  s.add_dependency("nokogiri", "~> 1.9.1")
+  s.add_dependency("nokogiri", ">= 1.9.1", "< 1.14.0")
   s.add_development_dependency("rspec", "~> 2.11")
   s.add_development_dependency("rake")
 end