diff --git a/Gemfile.lock b/Gemfile.lock
index 3ef7f9f..2516df2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
     parser (3.1.2.0)
       ast (~> 2.4.1)
     racc (1.6.0)
-    rack (2.2.4)
+    rack (3.0.8)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)