diff --git a/Gemfile.lock b/Gemfile.lock
index e111730..a34989f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -119,7 +119,7 @@ GEM
       mimemagic (= 0.3.0)
     pg (0.18.4)
     puma (3.4.0)
-    rack (2.0.6)
+    rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.0)