diff --git a/Gemfile.lock b/Gemfile.lock
index 77e22c13..a2973491 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,6 +49,7 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     concurrent-ruby (1.0.2)
+    crass (1.0.5)
     debug_inspector (0.0.2)
     erubis (2.7.0)
     execjs (2.7.0)
@@ -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 (2.3.1)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.6.4)
       mime-types (>= 1.16, < 4)
@@ -78,11 +80,9 @@ GEM
     minitest (5.9.0)
     multi_json (1.12.1)
     nio4r (1.2.1)
-    nokogiri (1.6.8)
+    nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
-      pkg-config (~> 1.1.7)
     pg (0.18.4)
-    pkg-config (1.1.7)
     puma (3.6.0)
     rack (2.0.1)
     rack-test (0.6.3)