diff --git a/Gemfile.lock b/Gemfile.lock
index ca0338f..361ef32 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
       websocket-driver (>= 0.2.0)
     puma (2.9.2)
       rack (>= 1.1, < 2.0)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.6)