diff --git a/Gemfile.lock b/Gemfile.lock
index 66afa2d..0bbd851 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,7 +69,7 @@ GEM
       ttfunk (~> 1.0.2)
     psych (3.1.0)
     public_suffix (4.0.1)
-    rack (2.0.8)
+    rack (2.2.3)
     rake (0.9.2.2)
     rb-fchange (0.0.5)
       ffi