diff --git a/Gemfile.lock b/Gemfile.lock
index 86dae79..f4bd824 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.3.8)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     bson (4.2.0)
     buftok (0.2.0)
     daemons (1.2.2)
@@ -39,6 +40,7 @@ GEM
     postmark (1.2.1)
       json
       rake
+    public_suffix (4.0.7)
     rack (1.6.11)
     rack-protection (1.5.3)
       rack