diff --git a/images/fluentd/outputs/Gemfile.lock b/images/fluentd/outputs/Gemfile.lock
index 63b893c27..b8e4d68cd 100644
--- a/images/fluentd/outputs/Gemfile.lock
+++ b/images/fluentd/outputs/Gemfile.lock
@@ -282,7 +282,7 @@ GEM
     net-smtp (0.4.0)
       net-protocol
     netrc (0.11.0)
-    nokogiri (1.18.3)
+    nokogiri (1.18.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     openid_connect (1.1.8)