diff --git a/cosmoz-i18next.js b/cosmoz-i18next.js
index 01fd206..79a8673 100644
--- a/cosmoz-i18next.js
+++ b/cosmoz-i18next.js
@@ -253,6 +253,10 @@ const
 class CosmozI18Next extends PolymerElement {
 	static get properties() { // eslint-disable-line max-lines-per-function
 		return {
+			compatibilityJSON: {
+				type: String,
+				value: 'v3',
+			},
 			domain: {
 				type: String,
 				value: 'messages'
@@ -296,6 +300,7 @@ class CosmozI18Next extends PolymerElement {
 	ready() {
 		super.ready();
 		i18n.init({
+			compatibilityJSON: this.compatibilityJSON,
 			interpolation: {
 				escapeValue: false,
 				prefix: this.interpolationPrefix,
diff --git a/web-test-runner.config.mjs b/web-test-runner.config.mjs
index fb97926..93ee6a8 100644
--- a/web-test-runner.config.mjs
+++ b/web-test-runner.config.mjs
@@ -1,6 +1 @@
-import cfg from '@neovici/cfg/web/test-runner.mjs';
-
-export default {
-	...cfg,
-	testFramework: { config: { ui: 'bdd' }},
-};
+export { default } from '@neovici/cfg/web/test-runner.mjs';