diff --git a/Gemfile.lock b/Gemfile.lock
index fc6595a4..994f597a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -63,7 +63,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (2.0.1)
+    rack (2.1.4)
     rake (12.0.0)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.7)