diff --git a/Gemfile.lock b/Gemfile.lock
index 1d121cd9..b8e49ae0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -30,7 +30,7 @@ GEM
       cri (~> 2.3)
     nokogiri (1.6.0)
       mini_portile (~> 0.5.0)
-    rack (1.5.2)
+    rack (2.2.3)
     rb-fsevent (0.9.3)
     rb-inotify (0.9.2)
       ffi (>= 0.5.0)