diff --git a/Gemfile.lock b/Gemfile.lock
index 1751883..cf84f21 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,7 +27,7 @@ GEM
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
     public_suffix (3.0.2)
-    rack (2.0.5)
+    rack (2.2.3)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rake (10.5.0)