diff --git a/Gemfile.lock b/Gemfile.lock
index e3643b6..9165362 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -58,7 +58,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.4.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     arbre (1.0.3)
       activesupport (>= 3.0.0)
     arel (6.0.3)
@@ -193,6 +194,7 @@ GEM
       slop (~> 3.4)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
+    public_suffix (4.0.6)
     puma (3.4.0)
     rack (1.6.4)
     rack-test (0.6.3)