diff --git a/Gemfile.lock b/Gemfile.lock
index abaa57a..f71e391 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -142,7 +142,7 @@ GEM
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
     public_suffix (2.0.5)
-    rack (2.0.3)
+    rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.1.2)