diff --git a/Gemfile.lock b/Gemfile.lock
index 6f25a05..4f26a2d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,9 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_portile2 (2.1.0)
     minitest (5.9.0)
     multi_json (1.12.1)
@@ -227,7 +229,6 @@ GEM
       websocket (~> 1.0)
     sendgrid (1.2.4)
       json
-      json
     shoulda-matchers (3.1.1)
       activesupport (>= 4.0.0)
     slop (3.6.0)
@@ -240,11 +241,11 @@ GEM
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.5)
     turbolinks (2.5.3)
       coffee-rails
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (3.0.0)
       execjs (>= 0.3.0, < 3)