diff --git a/Gemfile.lock b/Gemfile.lock
index fb10220..991895a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     minitest (5.10.3)
     mocha (1.2.1)
       metaclass (~> 0.0.1)
-    rack (2.0.3)
+    rack (3.0.6.1)
     rake (12.2.1)
     retry_it (0.1.2)