diff --git a/src/tchiba/Gemfile.lock b/src/tchiba/Gemfile.lock
index e9e2142..bd0b61f 100644
--- a/src/tchiba/Gemfile.lock
+++ b/src/tchiba/Gemfile.lock
@@ -149,7 +149,7 @@ GEM
     public_suffix (4.0.5)
     puma (4.3.5)
       nio4r (~> 2.0)
-    rack (2.2.3)
+    rack (2.2.6.2)
     rack-proxy (0.6.5)
       rack
     rack-test (1.1.0)