diff --git a/Gemfile.lock b/Gemfile.lock
index 61e48ce7..ba0f2631 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -161,7 +161,7 @@ GEM
       ttfunk
     public_suffix (5.0.4)
     racc (1.7.3)
-    rack (2.2.7)
+    rack (2.2.8)
     rack-livereload (0.3.17)
       rack
     rainbow (3.1.1)
@@ -181,9 +181,9 @@ GEM
     sassc (2.4.0)
       ffi (~> 1.9)
     servolux (0.13.0)
-    sprockets (3.7.2)
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
+      rack (>= 2.2.4, < 4)
     temple (0.10.3)
     thor (1.2.2)
     tilt (2.0.11)