diff --git a/Gemfile.lock b/Gemfile.lock
index 9e9111a..5d12657 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -247,9 +247,11 @@ 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)
+    mini_portile2 (2.5.1)
     minitest (5.10.1)
     minitest-reporters (1.1.14)
       ansi
@@ -259,10 +261,11 @@ GEM
     multi_json (1.12.1)
     nenv (0.3.0)
     nio4r (2.1.0)
-    nokogiri (1.8.0)
-      mini_portile2 (~> 2.2.0)
-    nokogiri (1.8.0-x86-mingw32)
-      mini_portile2 (~> 2.2.0)
+    nokogiri (1.11.4)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    nokogiri (1.11.4-x86-mingw32)
+      racc (~> 1.4)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -272,6 +275,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
+    racc (1.5.2)
     rack (2.0.3)
     rack-test (0.6.3)
       rack (>= 1.0)