diff --git a/Gemfile.lock b/Gemfile.lock
index 099a9af..e7d3f3a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,9 @@ GEM
     mime-types (3.0)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0221)
-    mimemagic (0.3.1)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_portile2 (2.0.0)
     minitest (5.8.4)
     multi_json (1.11.2)
@@ -204,11 +206,11 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.3.11)
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.2)
     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)