diff --git a/lib/download.ts b/lib/download.ts
index 08870af2..888bff5e 100644
--- a/lib/download.ts
+++ b/lib/download.ts
@@ -33,8 +33,6 @@ const pipelineAsync = promisify(pipeline);
 
 const vscodeStableReleasesAPI = `https://update.code.visualstudio.com/api/releases/stable`;
 const vscodeInsiderReleasesAPI = `https://update.code.visualstudio.com/api/releases/insider`;
-const vscodeInsiderCommitsAPI = (platform: string) =>
-	`https://update.code.visualstudio.com/api/commits/insider/${platform}`;
 
 const downloadDirNameFormat = /^vscode-(?<platform>[a-z]+)-(?<version>[0-9.]+)$/;
 const makeDownloadDirName = (platform: string, version: string) => `vscode-${platform}-${version}`;
@@ -155,10 +153,11 @@ async function isValidVersion(version: string, platform: string, timeout: number
 		}
 	}
 
-	const insiderCommits: string[] = await request.getJSON(vscodeInsiderCommitsAPI(platform), timeout);
-	if (insiderCommits.includes(version)) {
+	if (/^[0-9a-f]{40}$/.test(version)) {
 		return true;
 	}
+
+	return false;
 }
 
 /**
diff --git a/sample/src/test/runTest.ts b/sample/src/test/runTest.ts
index 087faad3..90cd2af3 100644
--- a/sample/src/test/runTest.ts
+++ b/sample/src/test/runTest.ts
@@ -4,116 +4,111 @@ import * as cp from 'child_process';
 import { runTests, downloadAndUnzipVSCode, resolveCliArgsFromVSCodeExecutablePath } from '../../..';
 
 async function go() {
-	try {
-		const extensionDevelopmentPath = path.resolve(__dirname, '../../../');
-		const extensionTestsPath = path.resolve(__dirname, './suite');
+	const extensionDevelopmentPath = path.resolve(__dirname, '../../../');
+	const extensionTestsPath = path.resolve(__dirname, './suite');
 
-		/**
-		 * Basic usage
-		 */
-		await runTests({
-			extensionDevelopmentPath,
-			extensionTestsPath
-		});
+	/**
+	 * Basic usage
+	 */
+	await runTests({
+		extensionDevelopmentPath,
+		extensionTestsPath,
+	});
 
-		const extensionTestsPath2 = path.resolve(__dirname, './suite2');
-		const testWorkspace = path.resolve(__dirname, '../../src/test-fixtures/fixture1');
+	const extensionTestsPath2 = path.resolve(__dirname, './suite2');
+	const testWorkspace = path.resolve(__dirname, '../../src/test-fixtures/fixture1');
 
-		/**
-		 * Running another test suite on a specific workspace
-		 */
-		await runTests({
-			extensionDevelopmentPath,
-			extensionTestsPath: extensionTestsPath2,
-			launchArgs: [testWorkspace]
-		});
+	/**
+	 * Running another test suite on a specific workspace
+	 */
+	await runTests({
+		extensionDevelopmentPath,
+		extensionTestsPath: extensionTestsPath2,
+		launchArgs: [testWorkspace],
+	});
 
-		/**
-		 * Use 1.36.1 release for testing
-		 */
-		await runTests({
-			version: '1.36.1',
-			extensionDevelopmentPath,
-			extensionTestsPath,
-			launchArgs: [testWorkspace]
-		});
+	/**
+	 * Use 1.36.1 release for testing
+	 */
+	await runTests({
+		version: '1.36.1',
+		extensionDevelopmentPath,
+		extensionTestsPath,
+		launchArgs: [testWorkspace],
+	});
 
-		/**
-		 * Use Insiders release for testing
-		 */
-		await runTests({
-			version: 'insiders',
-			extensionDevelopmentPath,
-			extensionTestsPath,
-			launchArgs: [testWorkspace]
-		});
+	/**
+	 * Use Insiders release for testing
+	 */
+	await runTests({
+		version: 'insiders',
+		extensionDevelopmentPath,
+		extensionTestsPath,
+		launchArgs: [testWorkspace],
+	});
 
-		/**
-		 * Use a specific Insiders commit for testing
-		 */
-		await runTests({
-			version: '9d3fbb3d9a50055be0a8c6d721625d02c9de492d',
-			extensionDevelopmentPath,
-			extensionTestsPath,
-			launchArgs: [testWorkspace]
-		});
+	/**
+	 * Use a specific Insiders commit for testing
+	 */
+	await runTests({
+		version: '9d3fbb3d9a50055be0a8c6d721625d02c9de492d',
+		extensionDevelopmentPath,
+		extensionTestsPath,
+		launchArgs: [testWorkspace],
+	});
 
-		/**
-		 * Noop, since 1.36.1 already downloaded to .vscode-test/vscode-1.36.1
-		 */
-		await downloadAndUnzipVSCode('1.36.1');
+	/**
+	 * Noop, since 1.36.1 already downloaded to .vscode-test/vscode-1.36.1
+	 */
+	await downloadAndUnzipVSCode('1.36.1');
 
-		/**
-		 * Manually download VS Code 1.35.0 release for testing.
-		 */
-		const vscodeExecutablePath = await downloadAndUnzipVSCode('1.35.0');
-		await runTests({
-			vscodeExecutablePath,
-			extensionDevelopmentPath,
-			extensionTestsPath,
-			launchArgs: [testWorkspace]
-		});
+	/**
+	 * Manually download VS Code 1.35.0 release for testing.
+	 */
+	const vscodeExecutablePath = await downloadAndUnzipVSCode('1.35.0');
+	await runTests({
+		vscodeExecutablePath,
+		extensionDevelopmentPath,
+		extensionTestsPath,
+		launchArgs: [testWorkspace],
+	});
 
-		/**
-		 * Install Python extension
-		 */
-		const [cli, ...args] = resolveCliArgsFromVSCodeExecutablePath(vscodeExecutablePath);
-		cp.spawnSync(cli, [...args, '--install-extension', 'ms-python.python'], {
-			encoding: 'utf-8',
-			stdio: 'inherit'
-		});
+	/**
+	 * Install Python extension
+	 */
+	const [cli, ...args] = resolveCliArgsFromVSCodeExecutablePath(vscodeExecutablePath);
+	cp.spawnSync(cli, [...args, '--install-extension', 'ms-python.python'], {
+		encoding: 'utf-8',
+		stdio: 'inherit',
+	});
+
+	/**
+	 * - Add additional launch flags for VS Code
+	 * - Pass custom environment variables to test runner
+	 */
+	await runTests({
+		vscodeExecutablePath,
+		extensionDevelopmentPath,
+		extensionTestsPath,
+		launchArgs: [
+			testWorkspace,
+			// This disables all extensions except the one being testing
+			'--disable-extensions',
+		],
+		// Custom environment variables for extension test script
+		extensionTestsEnv: { foo: 'bar' },
+	});
 
-		/**
-		 * - Add additional launch flags for VS Code
-		 * - Pass custom environment variables to test runner
-		 */
+	/**
+	 * Use win64 instead of win32 for testing Windows
+	 */
+	if (process.platform === 'win32') {
 		await runTests({
-			vscodeExecutablePath,
 			extensionDevelopmentPath,
 			extensionTestsPath,
-			launchArgs: [
-				testWorkspace,
-				// This disables all extensions except the one being testing
-				'--disable-extensions'
-			],
-			// Custom environment variables for extension test script
-			extensionTestsEnv: { foo: 'bar' }
+			version: '1.40.0',
+			platform: 'win32-x64-archive',
 		});
-
-		/**
-		 * Use win64 instead of win32 for testing Windows
-		 */
-		if (process.platform === 'win32') {
-			await runTests({
-				extensionDevelopmentPath,
-				extensionTestsPath,
-				version: '1.40.0',
-				platform: 'win32-x64-archive'
-			});
-		}
-	} catch (err) {
-		console.error('Failed to run tests');
-		process.exit(1);
 	}
 }