diff --git a/package.json b/package.json
index c622716..b6284e5 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
 		"read-pkg-up": "^9.1.0",
 		"redent": "^4.0.0",
 		"trim-newlines": "^5.0.0",
-		"type-fest": "^3.7.1",
+		"type-fest": "^3.9.0",
 		"yargs-parser": "^21.1.1"
 	},
 	"devDependencies": {
@@ -63,13 +63,14 @@
 		"common-tags": "^1.8.2",
 		"execa": "^7.1.1",
 		"indent-string": "^5.0.0",
-		"read-pkg": "^7.1.0",
-		"tsd": "^0.28.0",
-		"xo": "^0.53.1"
+		"read-pkg": "^8.0.0",
+		"tsd": "^0.28.1",
+		"xo": "^0.54.2"
 	},
 	"xo": {
 		"rules": {
-			"unicorn/no-process-exit": "off"
+			"unicorn/no-process-exit": "off",
+			"unicorn/error-message": "off"
 		}
 	},
 	"ava": {
diff --git a/readme.md b/readme.md
index d82246f..f20b6d1 100644
--- a/readme.md
+++ b/readme.md
@@ -18,14 +18,14 @@
 
 ## Install
 
-```
-$ npm install meow
+```sh
+npm install meow
 ```
 
 ## Usage
 
-```
-$ ./foo-app.js unicorns --rainbow
+```sh
+./foo-app.js unicorns --rainbow
 ```
 
 ```js
@@ -310,18 +310,4 @@ See [`get-stdin`](https://github.com/sindresorhus/get-stdin) if you want to acce
 
 See [`conf`](https://github.com/sindresorhus/conf) if you need to persist some data.
 
-See [`update-notifier`](https://github.com/yeoman/update-notifier) if you want update notifications.
-
 [More useful CLI utilities…](https://github.com/sindresorhus/awesome-nodejs#command-line-utilities)
-
----
-
-<div align="center">
-	<b>
-		<a href="https://tidelift.com/subscription/pkg/npm-meow?utm_source=npm-meow&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
-	</b>
-	<br>
-	<sub>
-		Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
-	</sub>
-</div>
diff --git a/source/parser.js b/source/parser.js
index 8daa714..c025581 100644
--- a/source/parser.js
+++ b/source/parser.js
@@ -14,7 +14,7 @@ const buildParserFlags = ({flags, booleanDefault}) => {
 		}
 
 		if (
-			typeof booleanDefault !== 'undefined'
+			booleanDefault !== undefined
 				&& flag.type === 'boolean'
 				&& !Object.hasOwn(flag, 'default')
 		) {
diff --git a/source/validate.js b/source/validate.js
index 5089316..effba37 100644
--- a/source/validate.js
+++ b/source/validate.js
@@ -87,7 +87,7 @@ const isFlagMissing = (flagName, definedFlags, receivedFlags, input) => {
 		}
 	}
 
-	if (typeof receivedFlags[flagName] === 'undefined') {
+	if (receivedFlags[flagName] === undefined) {
 		return isFlagRequired;
 	}
 
@@ -103,7 +103,7 @@ const reportMissingRequiredFlags = missingRequiredFlags => {
 
 export const checkMissingRequiredFlags = (flags, receivedFlags, input) => {
 	const missingRequiredFlags = [];
-	if (typeof flags === 'undefined') {
+	if (flags === undefined) {
 		return [];
 	}