diff --git a/Gemfile.lock b/Gemfile.lock
index af93c91..e634992 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -67,7 +67,8 @@ GEM
       mini_portile2 (~> 2.3.0)
     puma (3.11.4)
     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)