diff --git a/Gemfile b/Gemfile
index 414ced7a..e079c128 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem 'mail', '2.8.1'
 gem 'matrix', '0.4.2'
 gem 'mocha', '2.1.0', require: false
 gem 'net-smtp', '0.4.0.1'
-gem 'nokogiri', '1.15.5'
+gem 'nokogiri', '1.16.2'
 gem 'octokit', '8.0.0'
 gem 'pdd', '0.24.0'
 gem 'rack', '3.0.9'
diff --git a/Gemfile.lock b/Gemfile.lock
index a85ac058..fe75d070 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,9 +105,13 @@ GEM
       timeout
     net-smtp (0.4.0.1)
       net-protocol
-    nokogiri (1.15.5)
+    nokogiri (1.16.2)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
+    nokogiri (1.16.2-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.16.2-x86_64-linux)
+      racc (~> 1.4)
     oauth (0.6.2)
       snaky_hash (~> 2.0)
       version_gem (~> 1.1)
@@ -247,7 +251,7 @@ DEPENDENCIES
   matrix (= 0.4.2)
   mocha (= 2.1.0)
   net-smtp (= 0.4.0.1)
-  nokogiri (= 1.15.5)
+  nokogiri (= 1.16.2)
   octokit (= 8.0.0)
   pdd (= 0.24.0)
   rack (= 3.0.9)