diff --git a/lib/dependencies/HarmonyImportDependencyParserPlugin.js b/lib/dependencies/HarmonyImportDependencyParserPlugin.js
index 680a9b1da..47afe013e 100644
--- a/lib/dependencies/HarmonyImportDependencyParserPlugin.js
+++ b/lib/dependencies/HarmonyImportDependencyParserPlugin.js
@@ -6,6 +6,7 @@
 "use strict";
 
 const HotModuleReplacementPlugin = require("../HotModuleReplacementPlugin");
+const { LEGACY_ASSERT_ATTRIBUTES } = require("../javascript/JavascriptParser");
 const InnerGraph = require("../optimize/InnerGraph");
 const ConstDependency = require("./ConstDependency");
 const HarmonyAcceptDependency = require("./HarmonyAcceptDependency");
@@ -55,17 +56,16 @@ const harmonySpecifierTag = Symbol("harmony import");
 function getAttributes(node) {
 	if (
 		node.type === "ImportExpression" &&
-		node.arguments &&
-		node.arguments[0] &&
-		node.arguments[0].type === "ObjectExpression" &&
-		node.arguments[0].properties[0] &&
-		node.arguments[0].properties[0].type === "Property" &&
-		node.arguments[0].properties[0].value.type === "ObjectExpression" &&
-		node.arguments[0].properties[0].value.properties
+		node.options &&
+		node.options.type === "ObjectExpression" &&
+		node.options.properties[0] &&
+		node.options.properties[0].type === "Property" &&
+		node.options.properties[0].value.type === "ObjectExpression" &&
+		node.options.properties[0].value.properties
 	) {
 		const properties =
 			/** @type {Property[]} */
-			(node.arguments[0].properties[0].value.properties);
+			(node.options.properties[0].value.properties);
 		const result = /** @type {ImportAttributes} */ ({});
 		for (const property of properties) {
 			const key =
@@ -80,26 +80,23 @@ function getAttributes(node) {
 				(/** @type {Literal} */ (property.value).value);
 		}
 		const key =
-			node.arguments[0].properties[0].key.type === "Identifier"
-				? node.arguments[0].properties[0].key.name
-				: /** @type {Literal} */ (node.arguments[0].properties[0].key).value;
+			node.options.properties[0].key.type === "Identifier"
+				? node.options.properties[0].key.name
+				: /** @type {Literal} */ (node.options.properties[0].key).value;
+
 		if (key === "assert") {
 			result._isLegacyAssert = true;
 		}
+
 		return result;
 	}
+
 	// TODO remove cast when @types/estree has been updated to import assertions
-	const isImportAssertion =
-		/** @type {{ assertions?: ImportAttributeNode[] }} */ (node).assertions !==
-		undefined;
-	const attributes = isImportAssertion
-		? /** @type {{ assertions?: ImportAttributeNode[] }} */ (node).assertions
-		: /** @type {{ attributes?: ImportAttributeNode[] }} */ (node).attributes;
-	if (attributes === undefined) {
+	if (node.attributes === undefined) {
 		return;
 	}
 	const result = /** @type {ImportAttributes} */ ({});
-	for (const attribute of attributes) {
+	for (const attribute of node.attributes) {
 		const key =
 			/** @type {string} */
 			(
@@ -109,7 +106,8 @@ function getAttributes(node) {
 			);
 		result[key] = /** @type {string} */ (attribute.value.value);
 	}
-	if (isImportAssertion) {
+
+	if (node.attributes[LEGACY_ASSERT_ATTRIBUTES]) {
 		result._isLegacyAssert = true;
 	}
 	return result;
diff --git a/lib/javascript/JavascriptParser.js b/lib/javascript/JavascriptParser.js
index 6a3a90158..7e23c8c8f 100644
--- a/lib/javascript/JavascriptParser.js
+++ b/lib/javascript/JavascriptParser.js
@@ -5,8 +5,7 @@
 
 "use strict";
 
-const { Parser: AcornParser } = require("acorn");
-const { importAttributesOrAssertions } = require("acorn-import-attributes");
+const { Parser: AcornParser, tokTypes } = require("acorn");
 const { SyncBailHook, HookMap } = require("tapable");
 const vm = require("vm");
 const Parser = require("../Parser");
@@ -113,9 +112,68 @@ const ALLOWED_MEMBER_TYPES_CALL_EXPRESSION = 0b01;
 const ALLOWED_MEMBER_TYPES_EXPRESSION = 0b10;
 const ALLOWED_MEMBER_TYPES_ALL = 0b11;
 
-// Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API
+const LEGACY_ASSERT_ATTRIBUTES = Symbol("assert");
 
-const parser = AcornParser.extend(importAttributesOrAssertions);
+function importAssertions(Parser) {
+	return class extends Parser {
+		constructor(...args) {
+			super(...args);
+		}
+
+		parseWithClause() {
+			const nodes = [];
+
+			const isAssertLegacy = this.value === "assert";
+
+			if (
+				!this.eat(tokTypes._with) &&
+				isAssertLegacy &&
+				!this.eat(tokTypes.name)
+			) {
+				return nodes;
+			}
+
+			this.expect(tokTypes.braceL);
+
+			const attributeKeys = {};
+			let first = true;
+
+			while (!this.eat(tokTypes.braceR)) {
+				if (!first) {
+					this.expect(tokTypes.comma);
+					if (this.afterTrailingComma(tokTypes.braceR)) {
+						break;
+					}
+				} else {
+					first = false;
+				}
+
+				const attr = this.parseImportAttribute();
+				const keyName =
+					attr.key.type === "Identifier" ? attr.key.name : attr.key.value;
+
+				if (Object.prototype.hasOwnProperty.call(attributeKeys, keyName)) {
+					this.raiseRecoverable(
+						attr.key.start,
+						`Duplicate attribute key '${keyName}'`
+					);
+				}
+
+				attributeKeys[keyName] = true;
+				nodes.push(attr);
+			}
+
+			if (isAssertLegacy) {
+				nodes[LEGACY_ASSERT_ATTRIBUTES] = true;
+			}
+
+			return nodes;
+		}
+	};
+}
+
+// Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API
+const parser = AcornParser.extend(importAssertions);
 
 class VariableInfo {
 	/**
@@ -4866,3 +4924,4 @@ module.exports.ALLOWED_MEMBER_TYPES_EXPRESSION =
 	ALLOWED_MEMBER_TYPES_EXPRESSION;
 module.exports.ALLOWED_MEMBER_TYPES_CALL_EXPRESSION =
 	ALLOWED_MEMBER_TYPES_CALL_EXPRESSION;
+module.exports.LEGACY_ASSERT_ATTRIBUTES = LEGACY_ASSERT_ATTRIBUTES;
diff --git a/package.json b/package.json
index 47dfec70a..9c88f4b78 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,7 @@
     "@webassemblyjs/ast": "^1.12.1",
     "@webassemblyjs/wasm-edit": "^1.12.1",
     "@webassemblyjs/wasm-parser": "^1.12.1",
-    "acorn": "^8.7.1",
-    "acorn-import-attributes": "^1.9.5",
+    "acorn": "^8.14.0",
     "browserslist": "^4.24.0",
     "chrome-trace-event": "^1.0.2",
     "enhanced-resolve": "^5.17.1",
diff --git a/yarn.lock b/yarn.lock
index 0885a101c..e2032d079 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1482,11 +1482,6 @@ abbrev@1.0.x:
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.0.9.tgz#91b4792588a7738c25f35dd6f63752a2f8776135"
   integrity sha512-LEyx4aLEC3x6T0UguF6YILf+ntvmOaWsVfENmIW0E9H09vKlLDGelMjjSm0jkDHALj8A8quZ/HapKNigzwge+Q==
 
-acorn-import-attributes@^1.9.5:
-  version "1.9.5"
-  resolved "https://registry.yarnpkg.com/acorn-import-attributes/-/acorn-import-attributes-1.9.5.tgz#7eb1557b1ba05ef18b5ed0ec67591bfab04688ef"
-  integrity sha512-n02Vykv5uA3eHGM/Z2dQrcD56kL8TyDb2p1+0P83PClMnC/nc+anbQRhIOWnSq4Ke/KvDPrY3C9hDtC/A3eHnQ==
-
 acorn-jsx@^5.3.2:
   version "5.3.2"
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937"
@@ -1497,10 +1492,10 @@ acorn@^7.1.1:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.4.1.tgz#feaed255973d2e77555b83dbc08851a6c63520fa"
   integrity sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==
 
-acorn@^8.12.0, acorn@^8.7.1, acorn@^8.8.2:
-  version "8.12.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-8.12.1.tgz#71616bdccbe25e27a54439e0046e89ca76df2248"
-  integrity sha512-tcpGyI9zbizT9JbV6oYE477V6mTlXvvi0T0G3SNIYE2apm/G5huBa1+K89VGeovbg+jycCrfhl3ADxErOuO6Jg==
+acorn@^8.12.0, acorn@^8.14.0, acorn@^8.8.2:
+  version "8.14.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-8.14.0.tgz#063e2c70cac5fb4f6467f0b11152e04c682795b0"
+  integrity sha512-cl669nCJTZBsL97OF4kUQm5g5hC2uihk0NxY3WENAC0TYdILVkAyHymAntgxGkl7K+t0cXIrH5siy5S4XkFycA==
 
 aggregate-error@^3.0.0:
   version "3.1.0"
@@ -5035,8 +5030,7 @@ prelude-ls@~1.1.2:
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
   integrity sha512-ESF23V4SKG6lVSGZgYNpbsiaAkdab6ZgOxe52p7+Kid3W3u3bxR4Vfd/o21dmN7jSt0IwgZ4v5MUd26FEtXE9w==
 
-"prettier-2@npm:prettier@^2", prettier@^2.0.5:
-  name prettier-2
+"prettier-2@npm:prettier@^2":
   version "2.8.8"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
   integrity sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==
@@ -5048,6 +5042,11 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
+prettier@^2.0.5:
+  version "2.8.8"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
+  integrity sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==
+
 prettier@^3.2.1:
   version "3.3.3"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.3.3.tgz#30c54fe0be0d8d12e6ae61dbb10109ea00d53105"