diff --git a/appengine/standard-static-files/sinatra/Gemfile.lock b/appengine/standard-static-files/sinatra/Gemfile.lock
index e116c3729..be22ae356 100644
--- a/appengine/standard-static-files/sinatra/Gemfile.lock
+++ b/appengine/standard-static-files/sinatra/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.7.0)
-    nokogiri (1.18.9)
+    nokogiri (1.19.1)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     public_suffix (5.0.3)