continue working on this
diff --git a/packages/pouchdb-core/package.json b/packages/pouchdb-core/package.json
index 0b32029..2705328 100644
--- a/packages/pouchdb-core/package.json
+++ b/packages/pouchdb-core/package.json
@@ -19,6 +19,7 @@
     "inherits": "2.0.1",
     "js-extend": "1.0.1",
     "pouchdb-collections": "1.0.1",
+    "pouchdb-document-utils": "5.4.0-prerelease",
     "pouchdb-errors": "5.4.0-prerelease",
     "pouchdb-merge": "5.4.0-prerelease",
     "pouchdb-promise": "5.4.0-prerelease",