diff --git a/Gemfile.lock b/Gemfile.lock
index 6f25a05..806bb9f 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)
@@ -148,7 +150,7 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     puma (3.4.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.4)
@@ -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)