diff --git a/src/commands/validate-schema.ts b/src/commands/validate-schema.ts
index 4940f197a..e6697f1ab 100644
--- a/src/commands/validate-schema.ts
+++ b/src/commands/validate-schema.ts
@@ -9,12 +9,13 @@ import {
 	readAndValidateInputSchema,
 	readInputSchema,
 	readStorageSchema,
+	validateActorVersion,
 	validateDatasetSchema,
 	validateKvsSchema,
 	validateOutputSchema,
 } from '../lib/input_schema.js';
 import { error, info, success } from '../lib/outputs.js';
-import { Ajv2019 } from '../lib/utils.js';
+import { Ajv2019, getLocalConfig } from '../lib/utils.js';
 
 export class ValidateSchemaCommand extends ApifyCommand<typeof ValidateSchemaCommand> {
 	static override name = 'validate-schema' as const;
@@ -77,6 +78,18 @@ When no path is provided, validates all schemas found in '${LOCAL_CONFIG_PATH}':
 		let foundAny = false;
 		let hasErrors = false;
 
+		try {
+			const localConfig = getLocalConfig(cwd);
+
+			if (localConfig) {
+				validateActorVersion(localConfig);
+			}
+		} catch (err) {
+			foundAny = true;
+			hasErrors = true;
+			error({ message: (err as Error).message });
+		}
+
 		// Input schema — not using readAndValidateInputSchema here because it throws
 		// when no schema is found; in the all-schemas scan, a missing input schema
 		// should be silently skipped, not treated as an error.
diff --git a/src/lib/input_schema.ts b/src/lib/input_schema.ts
index 47b32af98..7e325b12b 100644
--- a/src/lib/input_schema.ts
+++ b/src/lib/input_schema.ts
@@ -15,6 +15,11 @@ import { ACTOR_SPECIFICATION_FOLDER, LOCAL_CONFIG_PATH } from './consts.js';
 import { info, warning } from './outputs.js';
 import { Ajv2019, getJsonFileContent, getLocalConfig, getLocalKeyValueStorePath } from './utils.js';
 
+// Actor versions on the platform are MAJOR.MINOR with non-negative integers and no leading
+// zeros. Three-part SemVer (e.g. "1.0.0") is a build-number format the platform rejects.
+// TODO: replace with the shared export from @apify/consts once apify-shared-js #655 lands.
+const ACTOR_VERSION_REGEX = /^(0|[1-9]\d*)\.(0|[1-9]\d*)$/;
+
 const DEFAULT_INPUT_SCHEMA_PATHS = [
 	'.actor/INPUT_SCHEMA.json',
 	'./INPUT_SCHEMA.json',
@@ -231,6 +236,22 @@ export const readOutputSchema = ({
 	};
 };
 
+export function validateActorVersion(config: Record<string, unknown>): void {
+	if (config.version === undefined) {
+		return;
+	}
+
+	if (typeof config.version === 'string' && ACTOR_VERSION_REGEX.test(config.version)) {
+		return;
+	}
+
+	const received = typeof config.version === 'string' ? `"${config.version}"` : JSON.stringify(config.version);
+
+	throw new Error(
+		`Actor version in '${LOCAL_CONFIG_PATH}' must be in MAJOR.MINOR format, for example "1.0". Received ${received}.`,
+	);
+}
+
 /**
  * Goes to the Actor directory and creates INPUT.json file from the input schema prefills.
 
diff --git a/test/local/commands/validate-schema.test.ts b/test/local/commands/validate-schema.test.ts
index a0ea91965..cd4f3f6b6 100644
--- a/test/local/commands/validate-schema.test.ts
+++ b/test/local/commands/validate-schema.test.ts
@@ -1,8 +1,10 @@
 import { mkdir, readFile, writeFile } from 'node:fs/promises';
 import { basename, join } from 'node:path';
+import process from 'node:process';
 
 import { ValidateSchemaCommand } from '../../../src/commands/validate-schema.js';
 import { testRunCommand } from '../../../src/lib/command-framework/apify-command.js';
+import { CommandExitCodes } from '../../../src/lib/consts.js';
 import { validDatasetSchemaPath } from '../../__setup__/dataset-schemas/paths.js';
 import { useConsoleSpy } from '../../__setup__/hooks/useConsoleSpy.js';
 import { useTempPath } from '../../__setup__/hooks/useTempPath.js';
@@ -20,11 +22,13 @@ async function setupActorConfig(
 	basePath: string,
 	{
 		inputSchema,
+		version,
 		datasetSchemaRef,
 		outputSchemaRef,
 		kvsSchemaRef,
 	}: {
 		inputSchema?: Record<string, unknown>;
+		version?: string;
 		datasetSchemaRef?: string | Record<string, unknown>;
 		outputSchemaRef?: string | Record<string, unknown>;
 		kvsSchemaRef?: string | Record<string, unknown>;
@@ -47,7 +51,7 @@ async function setupActorConfig(
 	const actorJson: Record<string, unknown> = {
 		actorSpecification: 1,
 		name: 'test-actor',
-		version: '0.1',
+		version: version ?? '0.1',
 		input: './input_schema.json',
 	};
 
@@ -131,6 +135,7 @@ describe('apify validate-schema', () => {
 		});
 
 		beforeEach(async () => {
+			process.exitCode = undefined;
 			await beforeAllCalls();
 		});
 
@@ -166,6 +171,33 @@ describe('apify validate-schema', () => {
 			expect(allMessages).not.toContain('Key-Value Store');
 		});
 
+		it.each(['1.0.0', '01.0', '1.01'])('should reject platform-invalid Actor version %s', async (version) => {
+			await setupActorConfig(joinPath(), { version });
+
+			await testRunCommand(ValidateSchemaCommand, {});
+
+			const allMessages = logMessages.error.join('\n');
+			expect(allMessages).toContain(
+				`Actor version in '.actor/actor.json' must be in MAJOR.MINOR format, for example "1.0". Received "${version}".`,
+			);
+			expect(allMessages).toContain('Input schema is valid');
+			expect(process.exitCode).toBe(CommandExitCodes.InvalidInput);
+		});
+
+		it.each(['0.0', '1.0', '99.99', '100.0', '1.100'])(
+			'should accept platform-valid Actor version %s',
+			async (version) => {
+				await setupActorConfig(joinPath(), { version });
+
+				await testRunCommand(ValidateSchemaCommand, {});
+
+				const allMessages = logMessages.error.join('\n');
+				expect(allMessages).toContain('Input schema is valid');
+				expect(allMessages).not.toContain('Actor version in');
+				expect(process.exitCode).toBeUndefined();
+			},
+		);
+
 		it('should report error for invalid dataset schema', async () => {
 			await setupActorConfig(joinPath(), {
 				datasetSchemaRef: {
@@ -214,6 +246,7 @@ describe('apify validate-schema', () => {
 
 		it('should only validate input schema when path arg is provided', async () => {
 			await setupActorConfig(joinPath(), {
+				version: '1.0.0',
 				datasetSchemaRef: validDatasetSchemaPath,
 				outputSchemaRef: validOutputSchemaPath,
 				kvsSchemaRef: validKvsSchemaPath,
@@ -225,6 +258,7 @@ describe('apify validate-schema', () => {
 
 			const allMessages = logMessages.error.join('\n');
 			expect(allMessages).toContain('Input schema is valid');
+			expect(allMessages).not.toContain('Actor version in');
 			expect(allMessages).not.toContain('Dataset');
 			expect(allMessages).not.toContain('Output');
 			expect(allMessages).not.toContain('Key-Value Store');