diff --git a/Gemfile.lock b/Gemfile.lock
index 380835b..38a5340 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -85,7 +85,7 @@ GEM
       ruby-ll (~> 2.1)
     open_uri_redirections (0.2.1)
     public_suffix (4.0.1)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.3)