diff --git a/Gemfile.lock b/Gemfile.lock
index 5a4bbca..4471b19 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,8 +33,8 @@ GEM
     activesupport (3.2.22.5)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     airbrussh (1.3.0)
       sshkit (>= 1.6.1, != 1.7.0)
     arel (3.0.3)
@@ -158,7 +158,7 @@ GEM
     pnotify-rails (1.2.2)
     polyglot (0.3.5)
     power_assert (1.1.3)
-    public_suffix (2.0.5)
+    public_suffix (5.0.0)
     racc (1.6.0)
     rack (1.4.7)
     rack-accept (0.4.5)