diff --git a/Gemfile.lock b/Gemfile.lock
index d0fe29655..e097b68b5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
       cri (~> 2.3)
     nokogiri (1.6.2.1)
       mini_portile (= 0.6.0)
-    rack (1.5.2)
+    rack (3.0.9.1)
     rake (0.9.6)
     rouge (1.4.0)
     thin (1.6.2)