diff --git a/Gemfile.lock b/Gemfile.lock
index 4d65541..f2355f2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (0.21.0)
     pg (0.21.0-x64-mingw32)
-    rack (1.6.8)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.10)