diff --git a/website/Gemfile b/website/Gemfile
index d8fac59d9..c47880d49 100644
--- a/website/Gemfile
+++ b/website/Gemfile
@@ -9,7 +9,7 @@ source 'https://rubygems.org' do
   gem 'rdf-turtle', '1.1.7'
   gem 'rdf-rdfa', '1.1.6'
   gem 'commaparty', '0.0.2'
-  gem 'nokogiri', '1.8.4'
+  gem 'nokogiri', '1.13.6'
   gem 'mustache', '1.0.2'
   gem 'github-markup', '1.4.0'
   gem 'coderay', '1.1.0'
diff --git a/website/Gemfile.lock b/website/Gemfile.lock
index a2334fa70..e5c465eed 100644
--- a/website/Gemfile.lock
+++ b/website/Gemfile.lock
@@ -40,14 +40,16 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.8.0)
     mustache (1.0.2)
     net-http-persistent (2.9.4)
-    nokogiri (1.8.4)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.13.6)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
     public_suffix (3.0.3)
+    racc (1.6.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
@@ -97,7 +99,7 @@ DEPENDENCIES
   github-markup (= 1.4.0)!
   jekyll (= 3.3.0)!
   mustache (= 1.0.2)!
-  nokogiri (= 1.8.4)!
+  nokogiri (= 1.13.6)!
   rdf (= 1.1.15)!
   rdf-aggregate-repo (= 1.1.0)!
   rdf-rdfa (= 1.1.6)!