diff --git a/Gemfile b/Gemfile
index 323309b9..3e1ca1c3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,7 +22,7 @@ gem 'spork-rails'
 
 gem 'rails_autolink', '>= 1.1.5'
 gem 'rdiscount'
-gem 'sanitize', '~> 2.0'
+gem 'sanitize', '~> 5.2'
 gem 'rouge'
 gem 'diff-lcs'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 821d23e0..0b197fdf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -194,6 +194,8 @@ GEM
     nokogiri (1.11.7)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
+    nokogumbo (2.0.5)
+      nokogiri (~> 1.8, >= 1.8.4)
     notiffany (0.0.7)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -294,8 +296,10 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.8.1)
-    sanitize (2.1.0)
-      nokogiri (>= 1.4.4)
+    sanitize (5.2.1)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.8.0)
+      nokogumbo (~> 2.0)
     sass (3.2.19)
     sass-rails (4.0.5)
       railties (>= 4.0.0, < 5.0)
@@ -414,7 +418,7 @@ DEPENDENCIES
   rspec-collection_matchers
   rspec-rails (~> 3.1.0)
   rubocop
-  sanitize (~> 2.0)
+  sanitize (~> 5.2)
   sass (~> 3.2.0)
   sass-rails (~> 4.0)
   shoulda-matchers