diff --git a/Gemfile.lock b/Gemfile.lock
index 8139742..34f7000 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     minitest (5.10.3)
     mocha (1.2.1)
       metaclass (~> 0.0.1)
-    rack (2.0.3)
+    rack (2.0.8)
     rake (12.2.1)
 
 PLATFORMS