diff --git a/Gemfile.lock b/Gemfile.lock
index e3643b6..6aecb1f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -194,7 +194,7 @@ GEM
     pry-rails (0.3.4)
       pry (>= 0.9.10)
     puma (3.4.0)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)