diff --git a/Gemfile.lock b/Gemfile.lock
index 73364087..3ef93349 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.4.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     aruba (0.13.0)
       childprocess (~> 0.5.6)
       contracts (~> 0.9)
@@ -82,6 +83,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
+    public_suffix (5.0.0)
     rack (1.6.4)
     rack-oauth2 (1.2.2)
       activesupport (>= 2.3)