diff --git a/Gemfile.lock b/Gemfile.lock
index 5dfe831..2c9ebc6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -84,7 +84,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.12.1)
     public_suffix (3.0.2)
-    rack (2.0.5)
+    rack (2.0.8)
     rake (12.3.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)