diff --git a/Gemfile.lock b/Gemfile.lock
index ece6bbf..839b889 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,8 @@ GEM
       tzinfo (~> 1.1)
     acts_as_list (0.7.4)
       activerecord (>= 3.0)
-    addressable (2.4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     administrate (0.1.4)
       autoprefixer-rails (~> 6.0)
       datetime_picker_rails (~> 0.0.7)
@@ -194,6 +195,7 @@ GEM
     premailer-rails (1.9.2)
       actionmailer (>= 3, < 6)
       premailer (~> 1.7, >= 1.7.9)
+    public_suffix (5.0.0)
     puma (3.4.0)
     rabl (0.11.8)
       activesupport (>= 2.3.14)