diff --git a/Gemfile.lock b/Gemfile.lock
index 456ddb678..09062c3d6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -665,7 +665,7 @@ GEM
     ruby-progressbar (1.7.5)
     rubyzip (1.1.7)
     safe_yaml (1.0.4)
-    sass (3.4.20)
+    sass (3.4.21)
     sass-rails (5.0.4)
       railties (>= 4.0.0, < 5.0)
       sass (~> 3.1)