diff --git a/Gemfile.lock b/Gemfile.lock
index 172c375e..d74ae208 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -282,7 +282,9 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mimemagic (0.3.2)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.8.0)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
@@ -345,7 +347,7 @@ GEM
     pundit (2.0.0)
       activesupport (>= 3.0.0)
     raabro (1.1.6)
-    rack (1.6.10)
+    rack (1.6.13)
     rack-protection (1.5.5)
       rack
     rack-test (0.6.3)