diff --git a/Gemfile.lock b/Gemfile.lock
index d873f5d..08d5eaf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     nio4r (2.6.1)
     puma (6.4.0)
       nio4r (~> 2.0)
-    rack (2.2.8)
+    rack (2.2.8.1)
     rack-protection (3.1.0)
       rack (~> 2.2, >= 2.2.4)
     ruby2_keywords (0.0.5)