diff --git a/pub/consts.js b/pub/consts.js
index 9f067af..d4d86b4 100644
--- a/pub/consts.js
+++ b/pub/consts.js
@@ -1,5 +1,8 @@
 module.exports = {
-  ASContext: 'https://www.w3.org/ns/activitystreams',
+  ASContext: [
+    'https://www.w3.org/ns/activitystreams',
+    'https://w3id.org/security/v1'
+  ],
   jsonldTypes: [
     'application/activity+json',
     'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',