diff --git a/__tests__/env.test.ts b/__tests__/env.test.ts
index d365a4b..309a94a 100644
--- a/__tests__/env.test.ts
+++ b/__tests__/env.test.ts
@@ -1,6 +1,9 @@
 /* eslint-disable no-magic-numbers */
+import { resolve } from 'path';
 import { testEnv } from '@technote-space/github-action-test-helper';
-import { setEnv } from '../src/env';
+import { setEnv, loadTokenFromEnv } from '../src/env';
+
+const fixturesDir = resolve(__dirname, 'fixtures');
 
 describe('setEnv', () => {
 	testEnv();
@@ -43,3 +46,16 @@ describe('setEnv', () => {
 		expect(process.env).toHaveProperty('INPUT_FETCH_DEPTH');
 	});
 });
+
+describe('loadTokenFromEnv', () => {
+	testEnv();
+
+	it('should load token', () => {
+		expect(loadTokenFromEnv(resolve(fixturesDir, 'test1'))).toBe('test-token1');
+		expect(loadTokenFromEnv(resolve(fixturesDir, 'test2'))).toBe('test-token2');
+	});
+
+	it('should not load token', () => {
+		expect(loadTokenFromEnv(resolve(fixturesDir, 'test3'))).toBeUndefined();
+	});
+});
diff --git a/__tests__/fixtures/test1/.env b/__tests__/fixtures/test1/.env
new file mode 100644
index 0000000..9204d61
--- /dev/null
+++ b/__tests__/fixtures/test1/.env
@@ -0,0 +1 @@
+TOKEN=test-token1
\ No newline at end of file
diff --git a/__tests__/fixtures/test2/.env b/__tests__/fixtures/test2/.env
new file mode 100644
index 0000000..5f9df67
--- /dev/null
+++ b/__tests__/fixtures/test2/.env
@@ -0,0 +1 @@
+token=test-token2
\ No newline at end of file
diff --git a/__tests__/index.test.ts b/__tests__/index.test.ts
index 91d1c5d..1d8fb45 100644
--- a/__tests__/index.test.ts
+++ b/__tests__/index.test.ts
@@ -24,6 +24,17 @@ describe('execute', () => {
 		process.argv = saveArgv;
 	});
 
+	it('should throw error', async() => {
+		process.argv = [
+			'node',
+			'index.js',
+			'-t',
+			'test/v1.2.3',
+		];
+
+		await expect(execute()).rejects.toThrow('<token> is required.');
+	});
+
 	it('should do nothing', async() => {
 		const mockExec   = spyOnExec();
 		const mockStdout = spyOnStdout();
diff --git a/package.json b/package.json
index 5be7680..db5b887 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "@technote-space/release-github-actions": "^3.0.4",
     "commander": "^4.1.1",
     "cosmiconfig": "^6.0.0",
+    "dotenv": "^8.2.0",
     "js-yaml": "^3.13.1"
   },
   "devDependencies": {
diff --git a/src/env.ts b/src/env.ts
index 47d6464..c7d077d 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -1,6 +1,17 @@
+import dotenv from 'dotenv';
+import { existsSync, readFileSync } from 'fs';
 import { resolve } from 'path';
 import { Config } from './types';
 
+export const loadTokenFromEnv = (dir: string): string | undefined => {
+	if (!existsSync(resolve(dir, '.env'))) {
+		return;
+	}
+
+	const config = dotenv.parse(readFileSync(resolve(dir, '.env')));
+	return config.token ?? config.TOKEN;
+};
+
 export const setEnv = (config: Config, token: string, workspace: string): void => {
 	process.env.INPUT_GITHUB_TOKEN = token;
 	process.env.GITHUB_ACTOR       = config.owner;
diff --git a/src/index.ts b/src/index.ts
index d63f36e..5dbb8ce 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,18 +2,24 @@ import commander from 'commander';
 import { getContextArgs, getGitHelper } from './misc';
 import { isValidContext, prepare, commit, push } from './wrapper';
 import { getConfig } from './config';
-import { setEnv } from './env';
+import { setEnv, loadTokenFromEnv } from './env';
 
 export const execute = async(): Promise<void> => {
 	commander
-		.requiredOption('--token <token>', 'token')
 		.requiredOption('-t, --tag <tag>', 'tag name')
+		.option('--token <token>', 'token')
 		.option('-b, --branch [branch]', 'branch name')
 		.option('-w, --workspace [workspace]', 'working directory name', '.')
 		.option('-p, --package [package]', 'package file directory name', process.cwd())
+		.option('-e, --env [env]', 'env file name', '.env')
 		.option('-n, --dry-run', 'show what would have been pushed')
 		.parse(process.argv);
 
+	const token = commander.token || loadTokenFromEnv(commander.package);
+	if (!token) {
+		throw new Error('<token> is required.');
+	}
+
 	const config = getConfig(commander.package);
 	const args   = getContextArgs(commander.tag, commander.branch, config);
 	setEnv(config, commander.token, commander.workspace);
diff --git a/yarn.lock b/yarn.lock
index d0e0f19..aff8159 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1651,6 +1651,11 @@ dot-prop@^3.0.0:
   dependencies:
     is-obj "^1.0.0"
 
+dotenv@^8.2.0:
+  version "8.2.0"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-8.2.0.tgz#97e619259ada750eea3e4ea3e26bceea5424b16a"
+  integrity sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw==
+
 ecc-jsbn@~0.1.1:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz#3a83a904e54353287874c564b7549386849a98c9"