diff --git a/Gemfile.lock b/Gemfile.lock
index 07f6a37..1c61e5e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
     plist (3.2.0)
     proxifier (1.0.3)
     public_suffix (2.0.4)
-    rack (2.0.8)
+    rack (2.2.3)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)