diff --git a/Gemfile.lock b/Gemfile.lock
index 88c7358..145e28f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -97,7 +97,7 @@ GEM
     pathutil (0.9.0)
       forwardable-extended (~> 2.6)
     pkg-config (1.1.7)
-    rack (1.6.4)
+    rack (2.0.8)
     rails-assets-jquery (2.2.3)
     rake (11.2.2)
     rb-fsevent (0.9.7)