diff --git a/Gemfile.lock b/Gemfile.lock
index db7d4fd..01d85e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -124,7 +124,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -201,7 +203,7 @@ GEM
     thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.9)
-    tzinfo (1.2.5)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     web-console (3.7.0)
       actionview (>= 5.0)