diff --git a/packages/angular/cli/BUILD.bazel b/packages/angular/cli/BUILD.bazel
index 20b1b6529b60..9e20fc349a84 100644
--- a/packages/angular/cli/BUILD.bazel
+++ b/packages/angular/cli/BUILD.bazel
@@ -69,6 +69,7 @@ ts_library(
         "//packages/angular_devkit/core/node",
         "//packages/angular_devkit/schematics",
         "//packages/angular_devkit/schematics/tools",
+        "@npm//@angular/core",
         "@npm//@types/debug",
         "@npm//@types/inquirer",
         "@npm//@types/node",
@@ -79,6 +80,7 @@ ts_library(
         "@npm//@types/uuid",
         "@npm//ansi-colors",
         "@npm//jsonc-parser",
+        "@npm//open",
         "@npm//ora",
     ],
 )
diff --git a/packages/angular/cli/commands/doc-impl.ts b/packages/angular/cli/commands/doc-impl.ts
index 375bf9260c8f..1c1fc86d1535 100644
--- a/packages/angular/cli/commands/doc-impl.ts
+++ b/packages/angular/cli/commands/doc-impl.ts
@@ -6,12 +6,11 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import * as open from 'open';
 import { Command } from '../models/command';
 import { Arguments } from '../models/interface';
 import { Schema as DocCommandSchema } from './doc';
 
-const open = require('open');
-
 export class DocCommand extends Command<DocCommandSchema> {
   public async run(options: DocCommandSchema & Arguments) {
     if (!options.keyword) {
@@ -39,7 +38,7 @@ export class DocCommand extends Command<DocCommandSchema> {
       // and use it if we can find it
       try {
         /* tslint:disable-next-line:no-implicit-dependencies */
-        const currentNgVersion = require('@angular/core').VERSION.major;
+        const currentNgVersion = (await import('@angular/core')).VERSION.major;
         domain = `v${currentNgVersion}.angular.io`;
       } catch (e) { }
     }
diff --git a/packages/angular_devkit/build_angular/src/dev-server/index.ts b/packages/angular_devkit/build_angular/src/dev-server/index.ts
index 281397370af0..575203d2271f 100644
--- a/packages/angular_devkit/build_angular/src/dev-server/index.ts
+++ b/packages/angular_devkit/build_angular/src/dev-server/index.ts
@@ -14,7 +14,7 @@ import {
 } from '@angular-devkit/build-webpack';
 import { json, tags } from '@angular-devkit/core';
 import * as path from 'path';
-import { Observable, from, of } from 'rxjs';
+import { Observable, from } from 'rxjs';
 import { concatMap, switchMap } from 'rxjs/operators';
 import * as ts from 'typescript';
 import * as url from 'url';
@@ -307,7 +307,7 @@ export function serveWebpackBrowser(
           webpackDevServerFactory: require('webpack-dev-server') as typeof webpackDevServer,
         },
       ).pipe(
-        concatMap((buildEvent, index) => {
+        concatMap(async (buildEvent, index) => {
           // Resolve serve address.
           const serverAddress = url.format({
             protocol: options.ssl ? 'https' : 'http',
@@ -325,8 +325,8 @@ export function serveWebpackBrowser(
             ` + '\n');
 
             if (options.open) {
-              const open = require('open');
-              open(serverAddress);
+              const open = await import('open');
+              await open(serverAddress);
             }
           }
 
@@ -334,7 +334,7 @@ export function serveWebpackBrowser(
             logger.info(`\n${colors.greenBright(colors.symbols.check)} Compiled successfully.`);
           }
 
-          return of({ ...buildEvent, baseUrl: serverAddress } as DevServerBuilderOutput);
+          return { ...buildEvent, baseUrl: serverAddress } as DevServerBuilderOutput;
         }),
       );
     }),