diff --git a/Gemfile.lock b/Gemfile.lock
index 9f928fb..038e2c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -257,9 +257,9 @@ GEM
       rdoc (>= 5.0, < 6.4.0)
     slop (3.6.0)
     spring (2.1.1)
-    sprockets (4.1.1)
+    sprockets (4.2.0)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
+      rack (>= 2.2.4, < 4)
     sprockets-rails (3.4.2)
       actionpack (>= 5.2)
       activesupport (>= 5.2)