diff --git a/Gemfile.lock b/Gemfile.lock
index fdcb997..fed3ea4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -36,7 +36,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.3.7)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     arel (6.0.0)
     axiom-types (0.1.1)
       descendants_tracker (~> 0.0.4)
@@ -152,6 +153,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
+    public_suffix (4.0.6)
     rack (1.6.0)
     rack-accept (0.4.5)
       rack (>= 0.4)