diff --git a/Gemfile.lock b/Gemfile.lock
index 30eebf3..6325007 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -40,8 +40,8 @@ GEM
       tzinfo (~> 1.1)
     acts_as_list (0.9.19)
       activerecord (>= 3.0)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     airbrussh (1.3.1)
       sshkit (>= 1.6.1, != 1.7.0)
     archive-zip (0.12.0)
@@ -266,7 +266,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     psych (3.1.0)
-    public_suffix (3.0.3)
+    public_suffix (4.0.7)
     puma (3.12.1)
     rack (2.0.7)
     rack-proxy (0.6.5)