diff --git a/LTI-Introduction/Gemfile b/LTI-Introduction/Gemfile
index b3ebd36..2f061f3 100644
--- a/LTI-Introduction/Gemfile
+++ b/LTI-Introduction/Gemfile
@@ -31,7 +31,7 @@ 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', '~> 1.13.2'
 
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
diff --git a/LTI-Introduction/Gemfile.lock b/LTI-Introduction/Gemfile.lock
index d7133a2..42be273 100644
--- a/LTI-Introduction/Gemfile.lock
+++ b/LTI-Introduction/Gemfile.lock
@@ -88,14 +88,16 @@ GEM
       mini_mime (>= 0.1.1)
     method_source (0.9.0)
     mini_mime (1.0.0)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     minitest (5.11.3)
     multi_json (1.13.1)
     mysql2 (0.4.10)
     nio4r (2.2.0)
-    nokogiri (1.10.4)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.2)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     public_suffix (3.0.2)
+    racc (1.6.0)
     rack (2.0.8)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
@@ -187,7 +189,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   mysql2
-  nokogiri (~> 1.10.4)
+  nokogiri (~> 1.13.2)
   rails (~> 5.1.4)
   sass-rails (~> 5.0)
   selenium-webdriver