diff --git a/Quiz-LTI/Gemfile b/Quiz-LTI/Gemfile
index ad1e9b5..db9d15e 100644
--- a/Quiz-LTI/Gemfile
+++ b/Quiz-LTI/Gemfile
@@ -30,7 +30,7 @@ gem 'jbuilder', '~> 2.5'
 # Use ActiveModel has_secure_password
 gem 'bcrypt', '~> 3.1.7'
 # Nokogiri is an open source software library to parse HTML and XML in Ruby. Explicitly updated to counter security vulnerability.
-gem 'nokogiri', '~> 1.10.4'
+gem 'nokogiri', '~> 1.12.5'
 
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
diff --git a/Quiz-LTI/Gemfile.lock b/Quiz-LTI/Gemfile.lock
index 20d46d5..7452282 100644
--- a/Quiz-LTI/Gemfile.lock
+++ b/Quiz-LTI/Gemfile.lock
@@ -89,15 +89,17 @@ GEM
       mini_mime (>= 0.1.1)
     method_source (0.9.0)
     mini_mime (0.1.4)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.6.1)
     minitest (5.10.3)
     multi_json (1.12.2)
     nio4r (2.1.0)
-    nokogiri (1.8.1)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
     oauth (0.5.3)
     public_suffix (3.0.0)
     puma (3.10.0)
+    racc (1.5.2)
     rack (2.0.3)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
@@ -193,6 +195,7 @@ DEPENDENCIES
   ims-lti (~> 1.1.8)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
+  nokogiri (~> 1.12.5)
   puma (~> 3.7)
   rails (~> 5.1.4)
   sass-rails (~> 5.0)