diff --git a/Gemfile.lock b/Gemfile.lock
index 32f9a5f..ccd1cc3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -133,7 +133,8 @@ GEM
       json
       websocket (~> 1.0)
     rack (2.0.7)
-    rack-cors (1.0.3)
+    rack-cors (1.0.5)
+      rack (>= 1.6.0)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.3)