diff --git a/Gemfile.lock b/Gemfile.lock
index 6a030be..d86cec6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,7 @@ GEM
       cliver (~> 0.3.1)
       websocket-driver (>= 0.2.0)
     public_suffix (2.0.5)
-    rack (1.6.5)
+    rack (1.6.12)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)