diff --git a/Gemfile.lock b/Gemfile.lock
index 990670f..e441702 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,7 @@ GEM
       rack (>= 1.2, < 3)
     psych (3.3.0)
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.6.2)
     rake (13.0.3)
     rb-scpt (1.0.3)
     rchardet (1.8.0)