diff --git a/README.md b/README.md
index 965b876..f6eea00 100644
--- a/README.md
+++ b/README.md
@@ -109,13 +109,13 @@ for the configuration object to pass as `preset`.
 - This option will be passed as the first argument to
   [`bumper.bump`](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-recommended-bump/README.md#api)
 - [Type definition for `whatBump` → look for `Preset['whatBump']`](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-recommended-bump/src/types.ts)
-- Use the `"undefined"` string value to skip releasing a new version.
+- Use the `false` Boolean value to skip releasing a new version.
 
 ```json
 {
   "plugins": {
     "@release-it/conventional-changelog": {
-      "whatBump": "undefined"
+      "whatBump": false
     }
   }
 }
diff --git a/index.js b/index.js
index ce3ba05..149f46f 100644
--- a/index.js
+++ b/index.js
@@ -46,8 +46,8 @@ class ConventionalChangelog extends Plugin {
       if (options.commitsOpts) bumper.commits(options.commitsOpts, options.parserOpts);
 
       async function getWhatBump() {
-        if (options.whatBump === 'undefined') {
-          return () => ({ releaseType: undefined });
+        if (options.whatBump === false) {
+          return () => ({ releaseType: null });
         } else {
           const bumperPreset = await bumper.preset;
 
diff --git a/test.js b/test.js
index 7c2de43..665142a 100644
--- a/test.js
+++ b/test.js
@@ -370,13 +370,13 @@ test('should not bump when recommended bump returns null', async () => {
   }
 });
 
-test('should not bump when whatBump === "undefined"', async () => {
+test('should not bump when whatBump === false', async () => {
   setup();
   sh.exec(`git tag 1.0.0`);
   add('fix', 'bar');
   add('feat', 'baz');
   {
-    const options = getOptions({ whatBump: 'undefined' });
+    const options = getOptions({ whatBump: false });
     const { version } = await runTasks(...options);
     assert.equal(version, undefined);
   }