diff --git a/Gemfile.lock b/Gemfile.lock
index bf1a371..ca0e060 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,6 +50,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.8)
+    crass (1.0.6)
     erubis (2.7.0)
     execjs (2.7.0)
     ffi (1.15.0)
@@ -66,7 +67,8 @@ GEM
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    loofah (2.0.3)
+    loofah (2.9.0)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.6.6)
       mime-types (>= 1.16, < 4)