diff --git a/Gemfile.lock b/Gemfile.lock
index ccb9ddc..986ef42 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.3.8)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     domain_name (0.5.25)
       unf (>= 0.0.5, < 1.0.0)
     eventmachine (1.0.8)
@@ -44,6 +45,7 @@ GEM
     minitest (5.8.1)
     multipart-post (2.0.0)
     oj (2.12.14)
+    public_suffix (5.0.0)
     rack (1.6.12)
     rack-protection (1.5.5)
       rack