diff --git a/package-lock.json b/package-lock.json
index af189c994..0478e26ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -64,7 +64,7 @@
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@@ -4085,6 +4085,12 @@
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+        "@types/uglify-js": "*",
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-        "upper-case": "^1.1.1"
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@@ -7115,9 +7222,9 @@
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@@ -9411,6 +9518,22 @@
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@@ -17076,9 +17142,18 @@
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@@ -19182,14 +19264,21 @@
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-      "integrity": "sha1-35T9jPZTHs915r75oIWPvHK+Ikc=",
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/param-case/-/param-case-3.0.4.tgz",
+      "integrity": "sha512-RXlj7zCYokReqWpOPH9oYivUzLYZ5vAPIfEmCTNViosC78F8F0H9y7T7gG2M39ymgutxF5gcFEsyZQSph9Bp3A==",
       "dev": true,
       "dependencies": {
-        "no-case": "^2.2.0"
+        "dot-case": "^3.0.4",
+        "tslib": "^2.0.3"
       }
     },
+    "node_modules/param-case/node_modules/tslib": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.2.tgz",
+      "integrity": "sha512-AEYxH93jGFPn/a2iVAwW87VuUIkR1FVUKB77NwMF7nBTDkDrrT/Hpt/IrCJ0QXhW27jTBDcf5ZY7w6RiqTMw2Q==",
+      "dev": true
+    },
     "node_modules/parent-module": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
@@ -19291,6 +19380,22 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/pascal-case": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/pascal-case/-/pascal-case-3.1.2.tgz",
+      "integrity": "sha512-uWlGT3YSnK9x3BQJaOdcZwrnV6hPpd8jFH1/ucpiLRPh/2zCVJKS19E4GvYHvaCcACn3foXZ0cLB9Wrx1KGe5g==",
+      "dev": true,
+      "dependencies": {
+        "no-case": "^3.0.4",
+        "tslib": "^2.0.3"
+      }
+    },
+    "node_modules/pascal-case/node_modules/tslib": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.6.2.tgz",
+      "integrity": "sha512-AEYxH93jGFPn/a2iVAwW87VuUIkR1FVUKB77NwMF7nBTDkDrrT/Hpt/IrCJ0QXhW27jTBDcf5ZY7w6RiqTMw2Q==",
+      "dev": true
+    },
     "node_modules/pascalcase": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/pascalcase/-/pascalcase-0.1.1.tgz",
@@ -21853,7 +21958,7 @@
     "node_modules/relateurl": {
       "version": "0.2.7",
       "resolved": "https://registry.npmjs.org/relateurl/-/relateurl-0.2.7.tgz",
-      "integrity": "sha1-VNvzd+UUQKypCkzSdGANP/LYiKk=",
+      "integrity": "sha512-G08Dxvm4iDN3MLM0EsP62EDV9IuhXPR6blNz6Utcp7zyV3tr4HVNINt6MpaRWbxoOHT3Q7YN2P+jaHX8vUbgog==",
       "dev": true,
       "engines": {
         "node": ">= 0.10"
@@ -28535,12 +28640,6 @@
         "topoquantize": "bin/topoquantize"
       }
     },
-    "node_modules/toposort": {
-      "version": "1.0.7",
-      "resolved": "https://registry.npmjs.org/toposort/-/toposort-1.0.7.tgz",
-      "integrity": "sha1-LmhELZ9k7HILjMieZEOsbKqVACk=",
-      "dev": true
-    },
     "node_modules/totalist": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/totalist/-/totalist-3.0.1.tgz",
@@ -29158,12 +29257,6 @@
       "integrity": "sha1-9RAYLYHugZ+4LDprIrYrve2ngI8=",
       "dev": true
     },
-    "node_modules/upper-case": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/upper-case/-/upper-case-1.1.3.tgz",
-      "integrity": "sha1-9rRQHC7EzdJrp4vnIilh3ndiFZg=",
-      "dev": true
-    },
     "node_modules/uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
diff --git a/package.json b/package.json
index 21c5af83d..e7afa5fad 100644
--- a/package.json
+++ b/package.json
@@ -99,7 +99,7 @@
     "git-bundle-sha": "0.0.2",
     "glob": "5.0.15",
     "google-libphonenumber": "3.2.18",
-    "html-webpack-plugin": "3.2.0",
+    "html-webpack-plugin": "4.5.2",
     "iso-3166-2": "1.0.0",
     "jest": "24.9.0",
     "jest-canvas-mock": "2.3.1",
diff --git a/webpack.config.js b/webpack.config.js
index 4010c6a44..0c65553da 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -66,6 +66,46 @@ pageRoutes.forEach(route => {
     ];
 });
 
+// HtmlWebpackPlugin v4 removed 'chunks' info that we need for our custom template.
+// This plugin is a quick-and-dirty partial implementation of that information.
+// Adapted from https://github.com/jantimon/html-webpack-plugin/issues/1369#issuecomment-1049968234
+// Thanks, @daniel-nagy!
+class HtmlWebpackBackwardsCompatibilityPlugin {
+    apply (compiler) {
+        compiler
+            .hooks
+            .compilation
+            .tap('HtmlWebpackBackwardsCompatibilityPlugin', compilation => {
+                HtmlWebpackPlugin
+                    .getHooks(compilation)
+                    .beforeAssetTagGeneration
+                    .tapAsync(
+                        'HtmlWebpackBackwardsCompatibilityPlugin',
+                        (data, callback) => {
+                            const {publicPath} = data.assets;
+                            const chunks = {};
+
+                            for (const entryPoint of compilation.entrypoints.values()) {
+                                for (const chunk of entryPoint.chunks) {
+                                    chunks[chunk.name] = {
+                                        entry: publicPath + chunk.files
+                                            .find(file => file.endsWith('.js')),
+                                        css: chunk.files
+                                            .filter(file => file.endsWith('.css'))
+                                            .map(file => publicPath + file)
+                                    };
+                                }
+                            }
+
+                            data.assets.chunks = chunks;
+
+                            callback(null, data);
+                        }
+                    );
+            });
+    }
+}
+
 // Config
 module.exports = {
     entry: entry,
@@ -164,6 +204,7 @@ module.exports = {
     },
     plugins: [
         new MiniCssExtractPlugin(),
+        new HtmlWebpackBackwardsCompatibilityPlugin(),
         new VersionPlugin({length: 5})
     ].concat(pageRoutes
         .map(route => new HtmlWebpackPlugin(defaults({}, {