diff --git a/Gemfile b/Gemfile
index 0f671ea..f4aad3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,4 @@ source 'https://rubygems.org'
 
 gem 'htmlentities'
 gem 'minitest'
-gem 'nokogiri', '1.6.6.2'
+gem 'nokogiri', '1.10.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2ad99d6..05e0835 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,10 +2,10 @@ GEM
   remote: https://rubygems.org/
   specs:
     htmlentities (4.3.4)
-    mini_portile2 (2.0.0)
+    mini_portile2 (2.4.0)
     minitest (4.7.5)
-    nokogiri (1.6.6.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
 
 PLATFORMS
   ruby
@@ -13,7 +13,7 @@ PLATFORMS
 DEPENDENCIES
   htmlentities
   minitest
-  nokogiri (= 1.6.6.2)
+  nokogiri (= 1.10.4)
 
 BUNDLED WITH
    1.11.2