diff --git a/Gemfile.lock b/Gemfile.lock
index 6a05bfc..9e578d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,8 +43,8 @@ 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)
     backports (3.11.1)
     bcrypt (3.1.11)
@@ -139,7 +139,7 @@ GEM
     nio4r (2.3.0)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
-    public_suffix (3.0.2)
+    public_suffix (4.0.6)
     puma (3.11.3)
     rack (2.0.4)
     rack-contrib (2.0.1)