diff --git a/Gemfile.lock b/Gemfile.lock
index f36ac41..b3a29e0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -80,7 +80,7 @@ GEM
     nio4r (2.1.0)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
-    rack (2.2.3)
+    rack (2.2.8.1)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
     rails (5.1.4)