diff --git a/Gemfile.lock b/Gemfile.lock
index 01c8094..79392c1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,8 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.3.6)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     coderay (1.0.9)
     crack (0.4.2)
       safe_yaml (~> 1.0.0)
@@ -42,6 +43,7 @@ GEM
       method_source (~> 0.8)
       slop (~> 3.4)
       spoon (~> 0.0)
+    public_suffix (5.0.0)
     rack (1.4.1)
     rack-proxy (0.5.15)
       rack