diff --git a/Gemfile.lock b/Gemfile.lock
index 4f3523d..bbd75a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,7 @@ GEM
       slop (~> 3.3.1)
     puma (4.3.1)
       nio4r (~> 2.0)
-    rack (2.0.7)
+    rack (2.0.8)
     redis (3.0.2)
     rspec (2.12.0)
       rspec-core (~> 2.12.0)