diff --git a/Gemfile b/Gemfile
index 31c24a6a8..02e456849 100644
--- a/Gemfile
+++ b/Gemfile
@@ -88,7 +88,7 @@ gem "redis", "~> 4.2.1" # Redis ruby client
 gem "redis-rails", "~> 5.0.2" # Redis for Ruby on Rails
 gem "reverse_markdown", "~> 2.0" # Map simple html back into markdown
 gem "rolify", "~> 5.3" # Very simple Roles library
-gem "rouge", "~> 3.20" # A pure-ruby code highlighter
+gem "rouge", "~> 3.21" # A pure-ruby code highlighter
 gem "rubyzip", "~> 2.3" # Rubyzip is a ruby library for reading and writing zip files
 gem "s3_direct_upload", "~> 0.1" # Direct Upload to Amazon S3
 gem "sassc-rails", "~> 2.1.2" # Integrate SassC-Ruby into Rails
diff --git a/Gemfile.lock b/Gemfile.lock
index 902df52f6..43e51d000 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -672,7 +672,7 @@ GEM
       nokogiri
     rexml (3.2.4)
     rolify (5.3.0)
-    rouge (3.20.0)
+    rouge (3.21.0)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
       rspec-expectations (~> 3.9.0)
@@ -990,7 +990,7 @@ DEPENDENCIES
   redis-rails (~> 5.0.2)
   reverse_markdown (~> 2.0)
   rolify (~> 5.3)
-  rouge (~> 3.20)
+  rouge (~> 3.21)
   rspec-rails (~> 4.0)
   rspec-retry (~> 0.6)
   rubocop (~> 0.88.0)
diff --git a/vendor/cache/rouge-3.20.0.gem b/vendor/cache/rouge-3.20.0.gem
deleted file mode 100644
index 694c49ba6..000000000
Binary files a/vendor/cache/rouge-3.20.0.gem and /dev/null differ
diff --git a/vendor/cache/rouge-3.21.0.gem b/vendor/cache/rouge-3.21.0.gem
new file mode 100644
index 000000000..3ad78cc71
Binary files /dev/null and b/vendor/cache/rouge-3.21.0.gem differ