diff --git a/lib/Parser.js b/lib/Parser.js
index cc53cce5794..3eb75bd5857 100644
--- a/lib/Parser.js
+++ b/lib/Parser.js
@@ -7,14 +7,13 @@
 // Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API
 
 const acorn = require("acorn");
-const acornDynamicImport = require("acorn-dynamic-import").default;
 const { Tapable, SyncBailHook, HookMap } = require("tapable");
 const util = require("util");
 const vm = require("vm");
 const BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
 const StackedSetMap = require("./util/StackedSetMap");
 
-const acornParser = acorn.Parser.extend(acornDynamicImport);
+const acornParser = acorn.Parser;
 
 const joinRanges = (startRange, endRange) => {
 	if (!endRange) return startRange;
@@ -25,7 +24,7 @@ const joinRanges = (startRange, endRange) => {
 const defaultParserOptions = {
 	ranges: true,
 	locations: true,
-	ecmaVersion: 2019,
+	ecmaVersion: 11,
 	sourceType: "module",
 	onComment: null
 };
diff --git a/package.json b/package.json
index b83860e9267..9139f62af9a 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,7 @@
     "@webassemblyjs/helper-module-context": "1.8.5",
     "@webassemblyjs/wasm-edit": "1.8.5",
     "@webassemblyjs/wasm-parser": "1.8.5",
-    "acorn": "^6.0.5",
-    "acorn-dynamic-import": "^4.0.0",
+    "acorn": "^6.2.0",
     "ajv": "^6.1.0",
     "ajv-keywords": "^3.1.0",
     "chrome-trace-event": "^1.0.0",
diff --git a/test/cases/parsing/precreated-ast/ast-loader.js b/test/cases/parsing/precreated-ast/ast-loader.js
index de009844f8c..fdb9333cee4 100644
--- a/test/cases/parsing/precreated-ast/ast-loader.js
+++ b/test/cases/parsing/precreated-ast/ast-loader.js
@@ -1,14 +1,14 @@
 "use strict";
 
 const acorn = require("acorn");
-const acornParser = acorn.Parser.extend(require("acorn-dynamic-import").default);
+const acornParser = acorn.Parser;
 
 module.exports = function(source) {
 	const comments = [];
 	const ast = acornParser.parse(source, {
 		ranges: true,
 		locations: true,
-		ecmaVersion: 2017,
+		ecmaVersion: 11,
 		sourceType: "module",
 		onComment: comments
 	});
diff --git a/yarn.lock b/yarn.lock
index 349051be98c..f4b394d2dd7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -595,11 +595,6 @@ accepts@~1.3.5:
     mime-types "~2.1.18"
     negotiator "0.6.1"
 
-acorn-dynamic-import@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz#482210140582a36b83c3e342e1cfebcaa9240948"
-  integrity sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==
-
 acorn-globals@^1.0.3:
   version "1.0.9"
   resolved "https://registry.yarnpkg.com/acorn-globals/-/acorn-globals-1.0.9.tgz#55bb5e98691507b74579d0513413217c380c54cf"
@@ -657,7 +652,7 @@ acorn@^5.5.3:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
   integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
 
-acorn@^6.0.1, acorn@^6.0.5, acorn@^6.0.7:
+acorn@^6.0.1, acorn@^6.0.7, acorn@^6.2.0:
   version "6.2.0"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.2.0.tgz#67f0da2fc339d6cfb5d6fb244fd449f33cd8bbe3"
   integrity sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==