diff --git a/js/package-lock.json b/js/package-lock.json
index 19d14da..404eede 100644
--- a/js/package-lock.json
+++ b/js/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "jupyter-golden-layout",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -5218,9 +5218,12 @@
       "dev": true
     },
     "node-fetch": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.0.tgz",
-      "integrity": "sha512-8dG4H5ujfvFiqDmVu9fQ5bOHUC15JMjMY/Zumv26oOvvVJjM67KF8koCWIabKQ1GJIa9r2mMZscBq/TbdOcmNA=="
+      "version": "2.6.7",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
+      "integrity": "sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==",
+      "requires": {
+        "whatwg-url": "^5.0.0"
+      }
     },
     "node-libs-browser": {
       "version": "2.2.1",
@@ -6895,6 +6898,11 @@
         "loader-utils": "^1.0.0"
       }
     },
+    "tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o="
+    },
     "tslib": {
       "version": "1.11.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.11.1.tgz",
@@ -7207,6 +7215,11 @@
         "neo-async": "^2.5.0"
       }
     },
+    "webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE="
+    },
     "webpack": {
       "version": "4.43.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.43.0.tgz",
@@ -7329,6 +7342,15 @@
         "source-map": "~0.6.1"
       }
     },
+    "whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
+      "requires": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",