diff --git a/Gemfile b/Gemfile
index ecc7311..5e2ac1f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem 'mail', '2.8.1'
 gem 'matrix', '0.4.2'
 gem 'mocha', '2.7.0', require: false
 gem 'net-smtp', '0.5.0'
-gem 'nokogiri', '1.16.8'
+gem 'nokogiri', '1.17.0'
 gem 'octokit', '9.2.0'
 gem 'pdd', '0.24.0'
 gem 'rack', '3.1.8'
diff --git a/Gemfile.lock b/Gemfile.lock
index b9cc145..391d6ee 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -112,12 +112,12 @@ GEM
       timeout
     net-smtp (0.5.0)
       net-protocol
-    nokogiri (1.16.8)
+    nokogiri (1.17.0)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.16.8-x86_64-darwin)
+    nokogiri (1.17.0-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.8-x86_64-linux)
+    nokogiri (1.17.0-x86_64-linux)
       racc (~> 1.4)
     oauth (0.6.2)
       snaky_hash (~> 2.0)
@@ -252,7 +252,7 @@ DEPENDENCIES
   matrix (= 0.4.2)
   mocha (= 2.7.0)
   net-smtp (= 0.5.0)
-  nokogiri (= 1.16.8)
+  nokogiri (= 1.17.0)
   octokit (= 9.2.0)
   pdd (= 0.24.0)
   rack (= 3.1.8)