diff --git a/Gemfile.lock b/Gemfile.lock
index 610570f..fc76c45 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -98,7 +98,7 @@ GEM
     nokogiri (1.8.0)
       mini_portile2 (~> 2.2.0)
     public_suffix (2.0.5)
-    rack (2.0.3)
+    rack (2.2.3)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.1.1)