diff --git a/Gemfile.lock b/Gemfile.lock
index 3af4a1f..4ee4624 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -136,7 +136,7 @@ GEM
       pry (>= 0.9.10, < 0.11.0)
     public_suffix (2.0.5)
     puma (3.9.1)
-    rack (2.0.3)
+    rack (2.2.2)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.1.1)