diff --git a/src/autoformat.js b/src/autoformat.js
index b061adc..fb4a9ef 100644
--- a/src/autoformat.js
+++ b/src/autoformat.js
@@ -79,12 +79,12 @@ export default class Autoformat extends Plugin {
 	_addListAutoformats() {
 		const commands = this.editor.commands;
 
-		if ( commands.has( 'bulletedList' ) ) {
+		if ( commands.get( 'bulletedList' ) ) {
 			// eslint-disable-next-line no-new
 			new BlockAutoformatEngine( this.editor, /^[*-]\s$/, 'bulletedList' );
 		}
 
-		if ( commands.has( 'numberedList' ) ) {
+		if ( commands.get( 'numberedList' ) ) {
 			// eslint-disable-next-line no-new
 			new BlockAutoformatEngine( this.editor, /^\d+[.|)]?\s$/, 'numberedList' );
 		}
@@ -105,14 +105,14 @@ export default class Autoformat extends Plugin {
 	_addBasicStylesAutoformats() {
 		const commands = this.editor.commands;
 
-		if ( commands.has( 'bold' ) ) {
+		if ( commands.get( 'bold' ) ) {
 			/* eslint-disable no-new */
 			new InlineAutoformatEngine( this.editor, /(\*\*)([^*]+)(\*\*)$/g, 'bold' );
 			new InlineAutoformatEngine( this.editor, /(__)([^_]+)(__)$/g, 'bold' );
 			/* eslint-enable no-new */
 		}
 
-		if ( commands.has( 'italic' ) ) {
+		if ( commands.get( 'italic' ) ) {
 			// The italic autoformatter cannot be triggered by the bold markers, so we need to check the
 			// text before the pattern (e.g. `(?:^|[^\*])`).
 
@@ -135,9 +135,7 @@ export default class Autoformat extends Plugin {
 	 * @private
 	 */
 	_addHeadingAutoformats() {
-		const commands = this.editor.commands;
-
-		Array.from( commands.keys() )
+		Array.from( this.editor.commands.names() )
 			.filter( name => name.match( /^heading[1-6]$/ ) )
 			.forEach( commandName => {
 				const level = commandName[ 7 ];
@@ -160,7 +158,7 @@ export default class Autoformat extends Plugin {
 	 * @private
 	 */
 	_addBlockQuoteAutoformats() {
-		if ( this.editor.commands.has( 'blockQuote' ) ) {
+		if ( this.editor.commands.get( 'blockQuote' ) ) {
 			// eslint-disable-next-line no-new
 			new BlockAutoformatEngine( this.editor, /^>\s$/, 'blockQuote' );
 		}
diff --git a/tests/autoformat.js b/tests/autoformat.js
index f4fc428..2dae99b 100644
--- a/tests/autoformat.js
+++ b/tests/autoformat.js
@@ -18,7 +18,7 @@ import VirtualTestEditor from '@ckeditor/ckeditor5-core/tests/_utils/virtualtest
 import { setData, getData } from '@ckeditor/ckeditor5-engine/src/dev-utils/model';
 import testUtils from '@ckeditor/ckeditor5-core/tests/_utils/utils';
 
-import Command from '@ckeditor/ckeditor5-core/src/command/command';
+import Command from '@ckeditor/ckeditor5-core/src/command';
 
 testUtils.createSinonSandbox();
 
@@ -122,19 +122,19 @@ describe( 'Autoformat', () => {
 			const spy6 = sinon.spy();
 
 			class Heading6 extends Command {
-				_doExecute() {
+				execute() {
 					spy6();
 				}
 			}
 			class Heading1 extends Command {
-				_doExecute() {
+				execute() {
 					spy1();
 				}
 			}
 
 			function HeadingPlugin( editor ) {
-				editor.commands.set( 'heading1', new Heading1() );
-				editor.commands.set( 'heading6', new Heading6() );
+				editor.commands.add( 'heading1', new Heading1( editor ) );
+				editor.commands.add( 'heading6', new Heading6( editor ) );
 			}
 
 			return VirtualTestEditor
diff --git a/tests/blockautoformatengine.js b/tests/blockautoformatengine.js
index 4ab088b..fe67dce 100644
--- a/tests/blockautoformatengine.js
+++ b/tests/blockautoformatengine.js
@@ -9,7 +9,7 @@ import VirtualTestEditor from '@ckeditor/ckeditor5-core/tests/_utils/virtualtest
 import Enter from '@ckeditor/ckeditor5-enter/src/enter';
 import { setData, getData } from '@ckeditor/ckeditor5-engine/src/dev-utils/model';
 import testUtils from '@ckeditor/ckeditor5-core/tests/_utils/utils';
-import Command from '@ckeditor/ckeditor5-core/src/command/command';
+import Command from '@ckeditor/ckeditor5-core/src/command';
 
 testUtils.createSinonSandbox();
 
@@ -30,7 +30,7 @@ describe( 'BlockAutoformatEngine', () => {
 	describe( 'Command name', () => {
 		it( 'should run a command when the pattern is matched', () => {
 			const spy = testUtils.sinon.spy();
-			editor.commands.set( 'testCommand', new TestCommand( editor, spy ) );
+			editor.commands.add( 'testCommand', new TestCommand( editor, spy ) );
 			new BlockAutoformatEngine( editor, /^[*]\s$/, 'testCommand' ); // eslint-disable-line no-new
 
 			setData( doc, '<paragraph>*[]</paragraph>' );
@@ -43,7 +43,7 @@ describe( 'BlockAutoformatEngine', () => {
 
 		it( 'should remove found pattern', () => {
 			const spy = testUtils.sinon.spy();
-			editor.commands.set( 'testCommand', new TestCommand( editor, spy ) );
+			editor.commands.add( 'testCommand', new TestCommand( editor, spy ) );
 			new BlockAutoformatEngine( editor, /^[*]\s$/, 'testCommand' ); // eslint-disable-line no-new
 
 			setData( doc, '<paragraph>*[]</paragraph>' );
@@ -103,7 +103,7 @@ class TestCommand extends Command {
 	 * Creates an instance of the command.
 	 *
 	 * @param {module:core/editor~Editor} editor Editor instance.
-	 * @param {Function} onExecuteCallback _doExecute call hook
+	 * @param {Function} onExecuteCallback execute call hook
 	 */
 	constructor( editor, onExecuteCallback ) {
 		super( editor );
@@ -116,7 +116,7 @@ class TestCommand extends Command {
 	 *
 	 * @protected
 	 */
-	_doExecute() {
+	execute() {
 		this.onExecute();
 	}
 }