diff --git a/Gemfile.lock b/Gemfile.lock
index d4f38e2..6bcab85 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,8 +92,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     airbrussh (1.4.0)
       sshkit (>= 1.6.1, != 1.7.0)
     arel (7.1.4)
@@ -292,7 +292,9 @@ GEM
     method_source (0.9.2)
     migration_data (0.3.1)
     mime-types (2.99.3)
-    mimemagic (0.3.3)
+    mimemagic (0.4.3)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.9.5)
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
@@ -345,7 +347,7 @@ GEM
     pg_search (2.1.7)
       activerecord (>= 4.2)
       activesupport (>= 4.2)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
     puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.2.3)