diff --git a/Gemfile.lock b/Gemfile.lock
index ca0338f..93dac4f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,7 +38,8 @@ 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)
     airbrussh (1.1.0)
       sshkit (>= 1.6.1, != 1.7.0)
     arel (6.0.3)
@@ -105,6 +106,7 @@ GEM
       cliver (~> 0.3.1)
       multi_json (~> 1.0)
       websocket-driver (>= 0.2.0)
+    public_suffix (5.0.0)
     puma (2.9.2)
       rack (>= 1.1, < 2.0)
     rack (1.6.4)