diff --git a/Gemfile.lock b/Gemfile.lock
index 0da6dd2..3ead4f0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -258,7 +258,7 @@ GEM
     posix-spawn (0.3.13)
     progressbar (1.10.1)
     public_suffix (3.1.1)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-contrib (2.1.0)
       rack (~> 2.0)
     rainbow (3.0.0)