diff --git a/Gemfile.lock b/Gemfile.lock
index 9d84b8c..a32108b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     coderay (1.1.1)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
@@ -12,6 +13,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
+    public_suffix (5.0.0)
     rake (10.5.0)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)