diff --git a/package.json b/package.json
index 22a0e7c..06db402 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,10 @@
     "@rdfjs/to-ntriples": "^3.0.1"
   },
   "devDependencies": {
+    "@rdfjs/data-model": "^2.0.2",
+    "@rdfjs/dataset": "^2.0.2",
     "@rdfjs/environment": "^1.0.0",
+    "@rdfjs/namespace": "^2.0.1",
     "c8": "^9.1.0",
     "codecov": "^3.8.3",
     "mocha": "^10.4.0",
diff --git a/test/support/factory.js b/test/support/factory.js
index 5826507..546befb 100644
--- a/test/support/factory.js
+++ b/test/support/factory.js
@@ -1,7 +1,7 @@
+import DataFactory from '@rdfjs/data-model/Factory.js'
+import DatasetFactory from '@rdfjs/dataset/Factory.js'
 import Environment from '@rdfjs/environment'
-import DataFactory from '@rdfjs/environment/DataFactory.js'
-import DatasetFactory from '@rdfjs/environment/DatasetFactory.js'
-import NamespaceFactory from '@rdfjs/environment/NamespaceFactory.js'
+import NamespaceFactory from '@rdfjs/namespace/Factory.js'
 
 const factory = new Environment([DataFactory, DatasetFactory, NamespaceFactory])