diff --git a/Gemfile.lock b/Gemfile.lock
index a71ece593f..febf107c0a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -150,7 +150,7 @@ GEM
     crack (0.4.5)
       rexml
     crass (1.0.6)
-    cssbundling-rails (1.3.3)
+    cssbundling-rails (1.4.0)
       railties (>= 6.0.0)
     cuprite (0.15)
       capybara (~> 3.0)