diff --git a/Gemfile.lock b/Gemfile.lock
index ad7c798..d50c417 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,8 @@ PATH
 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)
@@ -25,6 +26,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
+    public_suffix (5.0.0)
     rack (2.0.8)
     rack-test (0.6.3)
       rack (>= 1.0)