diff --git a/Gemfile.lock b/Gemfile.lock
index 0cbcf1a..9a53bb8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -136,7 +136,8 @@ GEM
       json
       websocket (~> 1.0)
     rack (2.0.5)
-    rack-cors (1.0.2)
+    rack-cors (1.0.5)
+      rack (>= 1.6.0)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.1.6)