diff --git a/Gemfile.lock b/Gemfile.lock
index b25add0..2707981 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -42,8 +42,8 @@ GEM
     acts_as_list (0.9.17)
       activerecord (>= 3.0)
     acts_as_votable (0.12.0)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     airbrussh (1.3.1)
       sshkit (>= 1.6.1, != 1.7.0)
     arel (8.0.0)
@@ -346,7 +346,7 @@ GEM
       json (>= 1, < 3)
     pg (0.21.0)
     popper_js (1.14.5)
-    public_suffix (3.0.3)
+    public_suffix (4.0.6)
     puma (3.12.0)
     rack (2.0.6)
     rack-protection (2.0.5)