diff --git a/Gemfile.lock b/Gemfile.lock
index 55b35f1..8eb38ad 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,7 +79,7 @@ GEM
       mini_portile2 (~> 2.1.0)
       pkg-config (~> 1.1.7)
     pkg-config (1.1.7)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.7.1)