diff --git a/Gemfile b/Gemfile
index 3be8ab8..03e756b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,4 +5,4 @@ require 'open-uri'
 versions = JSON.parse(open('https://pages.github.com/versions.json').read)
 
 gem 'github-pages', group: :jekyll_plugins
-gem 'nokogiri', '~>1.8.1'
+gem 'nokogiri', '~>1.13.6'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9d0aee5..fa055a7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -158,19 +158,21 @@ GEM
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9.7)
     mercenary (0.3.6)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.8.0)
     minima (2.1.1)
       jekyll (~> 3.3)
     minitest (5.10.2)
     multipart-post (2.0.0)
     net-dns (0.8.0)
-    nokogiri (1.8.1)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.13.6)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     octokit (4.7.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.14.0)
       forwardable-extended (~> 2.6)
     public_suffix (2.0.5)
+    racc (1.6.0)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.8)
       ffi (>= 0.5.0)
@@ -194,7 +196,7 @@ PLATFORMS
 
 DEPENDENCIES
   github-pages
-  nokogiri (~> 1.8.1)
+  nokogiri (~> 1.13.6)
 
 BUNDLED WITH
    1.16.0