diff --git a/Gemfile.lock b/Gemfile.lock
index 6a417717..275a71e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,8 +45,8 @@ GEM
       tzinfo (~> 1.1)
     acts_as_list (0.9.15)
       activerecord (>= 3.0)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     appsignal (2.6.1)
       rack
     archive-zip (0.11.0)
@@ -247,7 +247,9 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -287,7 +289,7 @@ GEM
     pry-stack_explorer (0.4.9.2)
       binding_of_caller (>= 0.7)
       pry (>= 0.9.11)
-    public_suffix (3.0.2)
+    public_suffix (4.0.7)
     puma (3.12.0)
     que (0.14.3)
     rack (2.0.6)