diff --git a/docs/Gemfile b/docs/Gemfile
index f144584eff350..dd0f626cc3ecc 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -17,7 +17,7 @@ gem 'json'
 gem 'rb-fsevent'
 
 # For markdown header cleanup
-gem 'sanitize', '~>2.0'
+gem 'sanitize', '~> 2.1', '>= 2.1.0'
 
 # Markdown
 gem 'redcarpet'
diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index e882cb6df037b..ced594a0bfdda 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -27,18 +27,17 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     mercenary (0.3.6)
-    mini_portile2 (2.1.0)
-    nokogiri (1.6.8)
-      mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
-    nokogiri (1.6.8-x64-mingw32)
-      mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
-    pkg-config (1.1.7)
+    mini_portile2 (2.8.0)
+    nokogiri (1.13.6)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    nokogiri (1.13.6-x64-mingw32)
+      racc (~> 1.4)
     posix-spawn (0.3.11)
     pygments.rb (0.6.3)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.2.0)
+    racc (1.6.0)
     rake (11.2.2)
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
@@ -46,7 +45,7 @@ GEM
     redcarpet (3.3.4)
     rouge (1.11.1)
     safe_yaml (1.0.4)
-    sanitize (2.1.0)
+    sanitize (2.1.1)
       nokogiri (>= 1.4.4)
     sass (3.4.22)
     yajl-ruby (1.2.1)
@@ -64,4 +63,7 @@ DEPENDENCIES
   rake
   rb-fsevent
   redcarpet
-  sanitize (~> 2.0)
+  sanitize (~> 2.1, >= 2.1.0)
+
+BUNDLED WITH
+   2.1.4