diff --git a/rack/blog/Gemfile.lock b/rack/blog/Gemfile.lock
index 1e92728..ef59c94 100644
--- a/rack/blog/Gemfile.lock
+++ b/rack/blog/Gemfile.lock
@@ -106,7 +106,7 @@ GEM
     msgpack (1.2.6)
     multi_json (1.13.1)
     nio4r (2.5.8)
-    nokogiri (1.13.3)
+    nokogiri (1.13.9)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     public_suffix (4.0.6)