diff --git a/packages/ckeditor5/src/plugins/copy_to_clipboard_button.ts b/packages/ckeditor5/src/plugins/copy_to_clipboard_button.ts
index 638e4e423..836549fb1 100644
--- a/packages/ckeditor5/src/plugins/copy_to_clipboard_button.ts
+++ b/packages/ckeditor5/src/plugins/copy_to_clipboard_button.ts
@@ -29,7 +29,7 @@ export class CopyToClipboardCommand extends Command {
 
     private executeCallback?: (text: string) => void;
 
-    execute(...args: Array<unknown>) {
+    override execute(...args: Array<unknown>) {
         const editor = this.editor;
         const model = editor.model;
         const selection = model.document.selection;
diff --git a/packages/ckeditor5/src/plugins/file_upload/fileuploadcommand.ts b/packages/ckeditor5/src/plugins/file_upload/fileuploadcommand.ts
index 1d6b2981d..d5a2c7237 100644
--- a/packages/ckeditor5/src/plugins/file_upload/fileuploadcommand.ts
+++ b/packages/ckeditor5/src/plugins/file_upload/fileuploadcommand.ts
@@ -5,7 +5,7 @@ interface FileUploadOpts {
 }
 
 export default class FileUploadCommand extends Command {
-	refresh() {
+	override refresh() {
 		this.isEnabled = true;
 	}
 
@@ -16,7 +16,7 @@ export default class FileUploadCommand extends Command {
 	 * @param {Object} options Options for the executed command.
 	 * @param {File|Array.<File>} options.file The file or an array of files to upload.
 	 */
-	execute( options: FileUploadOpts ) {
+	override execute( options: FileUploadOpts ) {
 		const editor = this.editor;
 		const model = editor.model;
 
diff --git a/packages/ckeditor5/src/plugins/includenote.ts b/packages/ckeditor5/src/plugins/includenote.ts
index c6dd615ba..0c7149078 100644
--- a/packages/ckeditor5/src/plugins/includenote.ts
+++ b/packages/ckeditor5/src/plugins/includenote.ts
@@ -135,14 +135,14 @@ class IncludeNoteEditing extends Plugin {
 }
 
 class InsertIncludeNoteCommand extends Command {
-	execute() {
+	override execute() {
 		const editorEl = this.editor.editing.view.getDomRoot();
 		const component = glob.getComponentByEl(editorEl);
 
 		component.triggerCommand('addIncludeNoteToText');
 	}
 
-	refresh() {
+	override refresh() {
 		const model = this.editor.model;
 		const selection = model.document.selection;
         const firstPosition = selection.getFirstPosition();
diff --git a/packages/ckeditor5/src/plugins/move_block_updown.ts b/packages/ckeditor5/src/plugins/move_block_updown.ts
index 580c8dbe4..3c955b6d1 100644
--- a/packages/ckeditor5/src/plugins/move_block_updown.ts
+++ b/packages/ckeditor5/src/plugins/move_block_updown.ts
@@ -34,7 +34,7 @@ abstract class MoveBlockUpDownCommand extends Command {
 	abstract getSibling(selectedBlock: Element);
     abstract get offset(): "before" | "after";
 
-    refresh() {
+    override refresh() {
 		const selection = this.editor.model.document.selection;
 		const selectedBlocks = this.getSelectedBlocks(selection);
 
@@ -44,7 +44,7 @@ abstract class MoveBlockUpDownCommand extends Command {
 		}
 	}
 
-	execute() {
+	override execute() {
 		const model = this.editor.model;
 		const selection = model.document.selection;
 		const selectedBlocks = this.getSelectedBlocks(selection);
diff --git a/packages/ckeditor5/src/plugins/referencelink.ts b/packages/ckeditor5/src/plugins/referencelink.ts
index 47662940b..106065ec6 100644
--- a/packages/ckeditor5/src/plugins/referencelink.ts
+++ b/packages/ckeditor5/src/plugins/referencelink.ts
@@ -8,7 +8,7 @@ export default class ReferenceLink extends Plugin {
 
 class ReferenceLinkCommand extends Command {
 
-	execute({ href }: { href: string }) {
+	override execute({ href }: { href: string }) {
 		if (!href?.trim()) {
 			return;
 		}
@@ -29,7 +29,7 @@ class ReferenceLinkCommand extends Command {
 		});
 	}
 
-	refresh() {
+	override refresh() {
 		const model = this.editor.model;
 		const selection = model.document.selection;
         this.isEnabled = selection.focus !== null && model.schema.checkChild(selection.focus.parent as Element, 'reference');