diff --git a/Gemfile.lock b/Gemfile.lock
index ada93f4..bb7d0e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,7 +69,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.2)
-    rack (2.0.4)
+    rack (2.1.4.3)
     rake (12.3.0)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)