diff --git a/typings/index.d.ts b/typings/index.d.ts
index b69ea9104..876d30e91 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -277,7 +277,8 @@ export interface OptionValues {
 export class Command {
   args: string[];
   processedArgs: any[];
-  commands: Command[];
+  readonly commands: readonly Command[];
+  readonly options: readonly Option[];
   parent: Command | null;
 
   constructor(name?: string);
diff --git a/typings/index.test-d.ts b/typings/index.test-d.ts
index 7b8af12ea..2d94f7e82 100644
--- a/typings/index.test-d.ts
+++ b/typings/index.test-d.ts
@@ -28,7 +28,8 @@ expectType<commander.Argument>(commander.createArgument('<foo>'));
 expectType<string[]>(program.args);
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 expectType<any[]>(program.processedArgs);
-expectType<commander.Command[]>(program.commands);
+expectType<ReadonlyArray<commander.Command>>(program.commands);
+expectType<ReadonlyArray<commander.Option>>(program.options);
 expectType<commander.Command | null>(program.parent);
 
 // version