diff --git a/Gemfile.lock b/Gemfile.lock
index 4f024a0..3dcb4d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.1)
       tzinfo (~> 1.1)
-    addressable (2.3.6)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     axiom-types (0.1.1)
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
@@ -48,6 +49,7 @@ GEM
     pry-byebug (2.0.0)
       byebug (~> 3.4)
       pry (~> 0.10)
+    public_suffix (5.0.0)
     rspec (3.1.0)
       rspec-core (~> 3.1.0)
       rspec-expectations (~> 3.1.0)