diff --git a/Gemfile.lock b/Gemfile.lock
index 6175b16..f2b39a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -84,7 +84,7 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     concurrent-ruby (1.0.1)
-    crass (1.0.5)
+    crass (1.0.6)
     cucumber (2.3.3)
       builder (>= 2.1.2)
       cucumber-core (~> 1.4.0)
@@ -135,7 +135,7 @@ GEM
     json (1.8.3)
     launchy (2.4.3)
       addressable (~> 2.3)
-    loofah (2.3.1)
+    loofah (2.18.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.6.4)
@@ -143,7 +143,9 @@ GEM
     mime-types (3.0)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0221)
-    mimemagic (0.3.1)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_portile2 (2.1.0)
     minitest (5.8.4)
     multi_json (1.11.2)
@@ -177,8 +179,8 @@ GEM
       activesupport (>= 4.2.0.beta, < 5.0)
       nokogiri (~> 1.6.0)
       rails-deprecated_sanitizer (>= 1.0.1)
-    rails-html-sanitizer (1.0.3)
-      loofah (~> 2.0)
+    rails-html-sanitizer (1.4.3)
+      loofah (~> 2.3)
     rails_12factor (0.0.3)
       rails_serve_static_assets
       rails_stdout_logging