diff --git a/examples/webpack/package.json b/examples/webpack/package.json
index f68f26416..5ce9a9b43 100644
--- a/examples/webpack/package.json
+++ b/examples/webpack/package.json
@@ -5,8 +5,8 @@
     "build": "webpack"
   },
   "devDependencies": {
-    "webpack": "4.21.0",
-    "webpack-cli": "^3.1.2",
+    "webpack": "^5.11.1",
+    "webpack-cli": "^4.3.1",
     "pdfjs-dist": "../../node_modules/pdfjs-dist"
   }
 }
diff --git a/gulpfile.js b/gulpfile.js
index 7d9ea3eeb..560dd98e1 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -1969,6 +1969,9 @@ function packageBowerJson() {
     homepage: DIST_HOMEPAGE,
     bugs: DIST_BUGS_URL,
     license: DIST_LICENSE,
+    peerDependencies: {
+      "worker-loader": "^3.0.7", // Used in `external/dist/webpack.js`.
+    },
     browser: {
       canvas: false,
       fs: false,