diff --git a/Gemfile b/Gemfile
index 813bc42..98df24c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,7 @@ gem 'image_processing', '~> 1.9.3'
 gem 'jbuilder', '~> 2.10.0'
 gem 'mini_magick', '~> 4.10.1'
 gem 'net-ldap', '~> 0.16.0'
-gem 'nokogiri', '~> 1.6', '>= 1.6.8'
+gem 'nokogiri', '~> 1.13'
 gem 'openssl', '~> 2.1', '>= 2.1.2'
 gem 'puma', '~> 4.3.5'
 gem 'rack', '>= 2.2.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 74384b6..b925719 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -145,10 +145,12 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.10.1)
     mini_mime (1.0.2)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     minitest (5.14.2)
     minitest-reporters (1.4.2)
       ansi
@@ -159,8 +161,9 @@ GEM
     nenv (0.3.0)
     net-ldap (0.16.3)
     nio4r (2.5.4)
-    nokogiri (1.10.10)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.5)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -174,6 +177,7 @@ GEM
     public_suffix (4.0.6)
     puma (4.3.6)
       nio4r (~> 2.0)
+    racc (1.6.0)
     rack (2.2.3)
     rack-proxy (0.6.5)
       rack
@@ -298,7 +302,7 @@ DEPENDENCIES
   minitest (~> 5.14.0)
   minitest-reporters (~> 1.4.2)
   net-ldap (~> 0.16.0)
-  nokogiri (~> 1.6, >= 1.6.8)
+  nokogiri (~> 1.13)
   openssl (~> 2.1, >= 2.1.2)
   pg (~> 1.2.2)
   pry-rails