diff --git a/Gemfile.lock b/Gemfile.lock
index 25c1bac..2cfba7e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -112,7 +112,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.1.1)
-    rack (2.0.6)
+    rack (2.2.3.1)
     rake (12.3.2)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)