diff --git a/objects/publication/definition.json b/objects/publication/definition.json
index f7b354c..179b765 100644
--- a/objects/publication/definition.json
+++ b/objects/publication/definition.json
@@ -43,7 +43,7 @@
     },
     "contributor": {
       "description": "Contributors include editors, compilers, and translators.",
-      "misp-attribute": "attachment",
+      "misp-attribute": "text",
       "multiple": true,
       "ui-priority": 0
     },
@@ -122,8 +122,11 @@
   "meta-category": "misc",
   "name": "publication",
   "requiredOneOf": [
-    "name"
+    "title",
+    "link",
+    "archive",
+    "ISBN"
   ],
   "uuid": "8a86b056-7f2c-4c1b-b04e-a6bac4443068",
-  "version": 1
+  "version": 2
 }
\ No newline at end of file