diff --git a/Gemfile b/Gemfile
index 7fc47f74e..11df2f093 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,7 +27,7 @@ gem 'json', '>= 2.3.0'
 gem 'mutex_m', '~> 0.2.0' # ruby 3.4.0 warning said to add
 gem 'net-imap', '~> 0.5.6' # ruby 3.4.0 warning said to add
 gem 'newrelic_rpm'
-gem 'nokogiri', '~> 1.16.5'
+gem 'nokogiri', '~> 1.18.3'
 gem 'oj' # Amazon Linux `json` gem causes conflicts, but `multi_json` will prefer `oj` if installed
 gem 'pg' # Use postgresql as the database for Active Record
 gem 'puma', '~> 6.4.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3d6339d8f..e8ab66043 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -296,11 +296,11 @@ GEM
       net-protocol
     newrelic_rpm (9.13.0)
     nio4r (2.7.4)
-    nokogiri (1.16.8-aarch64-linux)
+    nokogiri (1.18.3-aarch64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.16.8-arm64-darwin)
+    nokogiri (1.18.3-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.8-x86_64-linux)
+    nokogiri (1.18.3-x86_64-linux-gnu)
       racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
@@ -576,7 +576,7 @@ DEPENDENCIES
   mutex_m (~> 0.2.0)
   net-imap (~> 0.5.6)
   newrelic_rpm
-  nokogiri (~> 1.16.5)
+  nokogiri (~> 1.18.3)
   oj
   parallel_tests
   pg