diff --git a/Gemfile.lock b/Gemfile.lock
index 32dcb70..0e117e0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,8 +47,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     arel (8.0.0)
     bcrypt (3.1.11)
     binding_of_caller (0.7.2)
@@ -206,7 +206,7 @@ GEM
     pg (0.21.0)
     polyamorous (1.3.1)
       activerecord (>= 3.0)
-    public_suffix (3.0.0)
+    public_suffix (5.0.0)
     rack (2.0.5)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)