diff --git a/Gemfile.lock b/Gemfile.lock
index 836e3eb..f31caa4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     mini_portile (0.6.1)
     nokogiri (1.6.5)
       mini_portile (~> 0.6.0)
-    rack (1.2.2)
+    rack (1.5.2)
     sinatra (1.2.6)
       rack (~> 1.1)
       tilt (>= 1.2.2, < 2.0)