diff --git a/Gemfile.lock b/Gemfile.lock
index 9e9111a..76d34bd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -247,7 +247,9 @@ 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 (4.5.1)
     mini_portile2 (2.2.0)
     minitest (5.10.1)
@@ -352,7 +354,7 @@ GEM
     turbolinks (5.0.1)
       turbolinks-source (~> 5)
     turbolinks-source (5.0.3)
-    tzinfo (1.2.3)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     tzinfo-data (1.2017.2)
       tzinfo (>= 1.0.0)