diff --git a/Gemfile b/Gemfile
index 354319f..226c5be 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2'
 # Lock some dependencies that require newer versions of ruby
 gem 'i18n', '~> 1.4'
 gem 'nio4r', '~> 2.3'
-gem 'nokogiri', '~> 1.9'
+gem 'nokogiri', '~> 1.13'
 
 gem 'json', '~> 2.1'
 gem 'sqlite3', '~> 1.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 2d17fba..e5584a8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -80,7 +80,7 @@ GEM
     mini_portile2 (2.8.0)
     minitest (5.15.0)
     nio4r (2.5.8)
-    nokogiri (1.13.3)
+    nokogiri (1.13.9)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     parallel (1.22.0)
@@ -172,7 +172,7 @@ DEPENDENCIES
   json (~> 2.1)
   letter_opener (~> 1.6)
   nio4r (~> 2.3)
-  nokogiri (~> 1.9)
+  nokogiri (~> 1.13)
   puma
   rails (~> 5.2)
   redcarpet (~> 3.4)