diff --git a/Gemfile.lock b/Gemfile.lock
index e263cd6..27c4dc3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
     parser (2.7.0.2)
       ast (~> 2.4.0)
     phantomjs (2.1.1.0)
-    rack (2.2.3)
+    rack (3.0.7)
     rainbow (3.0.0)
     rake (13.0.1)
     rexml (3.2.5)