diff --git a/Gemfile.lock b/Gemfile.lock
index 88ff56a..821d529 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,7 +104,7 @@ GEM
     puma (4.3.8)
       nio4r (~> 2.0)
     racc (1.5.2)
-    rack (2.0.6)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.6.1)