diff --git a/Gemfile b/Gemfile
index 82dfa0c806..b07b1934f0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,7 +16,7 @@ gem 'page-toc-filter', '~> 0.0.1'
 gem 'builder', '~> 3.2'
 
 group :development do
-  gem 'nokogiri', '~> 1.6.0'
+  gem 'nokogiri', '~> 1.6.8'
   gem 'rake', '10.3.2'
   gem 'awesome_print', '1.6.1'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 03314fa408..b4d62df8a1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -87,7 +87,7 @@ GEM
     mime-types (3.0)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2015.1120)
-    mini_portile2 (2.0.0)
+    mini_portile2 (2.1.0)
     minitest (5.8.4)
     multi_json (1.11.2)
     multipart-post (2.0.0)
@@ -100,8 +100,8 @@ GEM
     nanoc-html-pipeline (0.3.3)
       html-pipeline (~> 2.0)
       nanoc (>= 3.1, < 5.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    nokogiri (1.6.8.1)
+      mini_portile2 (~> 2.1.0)
     octokit (4.2.0)
       sawyer (~> 0.6.0, >= 0.5.3)
     oj (2.14.1)
@@ -186,7 +186,7 @@ DEPENDENCIES
   nanoc (~> 4.0)
   nanoc-conref-fs (~> 0.5)
   nanoc-html-pipeline (= 0.3.3)
-  nokogiri (~> 1.6.0)
+  nokogiri (~> 1.6.8)
   page-toc-filter (~> 0.0.1)
   rake (= 10.3.2)
   rspec (= 3.1)