diff --git a/js/packages/binderhub-client/package.json b/js/packages/binderhub-client/package.json
index 3f6b155ff..1b83b30e3 100644
--- a/js/packages/binderhub-client/package.json
+++ b/js/packages/binderhub-client/package.json
@@ -18,6 +18,8 @@
   },
   "devDependencies": {
     "@types/jest": "^29.5.5",
+    "@babel/core": "^7.21.4",
+    "@babel/preset-env": "^7.21.4",
     "babel-jest": "^29.7.0",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0"