diff --git a/Gemfile.lock b/Gemfile.lock
index 3696e4e..d439361 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -162,7 +162,7 @@ GEM
     letsencrypt-rails-heroku (2.0.3)
       acme-client (~> 2.0)
       platform-api (>= 2.2, < 4)
-    loofah (2.13.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)