diff --git a/Gemfile.lock b/Gemfile.lock
index 8e0011d..2fb8795 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 (2.3.8)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     arel (6.0.3)
     builder (3.2.2)
     descendants_tracker (0.0.4)
@@ -88,6 +89,7 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (~> 1.2)
+    public_suffix (4.0.6)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)