diff --git a/Gemfile.lock b/Gemfile.lock
index 60b1697..efd1287 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -255,7 +255,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.3)
-    rack (2.0.6)
+    rack (2.2.3)
     rainbow (3.0.0)
     rake (12.3.2)
     rb-fsevent (0.10.3)