diff --git a/Gemfile.lock b/Gemfile.lock
index b7ac083..a4cf40d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,8 +38,8 @@ GEM
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     arel (8.0.0)
     bindex (0.5.0)
     builder (3.2.3)
@@ -90,7 +90,7 @@ GEM
     nokogiri (1.8.0)
       mini_portile2 (~> 2.2.0)
     pg (0.21.0)
-    public_suffix (3.0.0)
+    public_suffix (4.0.6)
     puma (3.10.0)
     rack (2.0.3)
     rack-test (0.7.0)