diff --git a/rack/blog/Gemfile.lock b/rack/blog/Gemfile.lock
index 1e92728..6b20027 100644
--- a/rack/blog/Gemfile.lock
+++ b/rack/blog/Gemfile.lock
@@ -113,7 +113,7 @@ GEM
     puma (4.3.9)
       nio4r (~> 2.0)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.6.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.2)