diff --git a/Gemfile.lock b/Gemfile.lock
index c1f316b..8bee5f0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -253,7 +253,9 @@ 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 (2.4.0)
     minitest (5.14.0)
@@ -382,7 +384,7 @@ GEM
     turbolinks (5.0.1)
       turbolinks-source (~> 5)
     turbolinks-source (5.0.3)
-    tzinfo (1.2.6)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     tzinfo-data (1.2017.2)
       tzinfo (>= 1.0.0)