diff --git a/Gemfile.lock b/Gemfile.lock
index 538f38e..2b95ffc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GIT
-  remote: git://github.com/rails/activesupport-json_encoder.git
+  remote: https://github.com/rails/activesupport-json_encoder.git
   revision: d874fd9dbf2d558eac87893578e8e7970f1581a5
   specs:
     activesupport-json_encoder (1.1.0)
@@ -162,7 +162,9 @@ GEM
       nokogiri (>= 1.5.9)
     lumberjack (1.0.10)
     method_source (0.8.2)
-    mimemagic (0.3.1)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_portile2 (2.0.0)
     minitest (5.8.4)
     multi_json (1.11.2)
@@ -292,7 +294,7 @@ GEM
       eventmachine (~> 1.0, >= 1.0.4)
       rack (~> 1.0)
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.2)
     timecop (0.8.0)
     trollop (2.1.2)
@@ -301,7 +303,7 @@ GEM
       ripl-multi_line (>= 0.2.4)
       ripl-rack (>= 0.2.0)
       sinatra (>= 1.2.1)
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     unicode-display_width (1.0.2)
     unicorn (5.0.1)