diff --git a/source/vendor/supports-color/browser.js b/source/vendor/supports-color/browser.js
index 9fa6888..f9008d8 100644
--- a/source/vendor/supports-color/browser.js
+++ b/source/vendor/supports-color/browser.js
@@ -1,14 +1,19 @@
 /* eslint-env browser */
+/* eslint-disable n/no-unsupported-features/node-builtins */
 
 const level = (() => {
-	if (navigator.userAgentData) {
+	if (!('navigator' in globalThis)) {
+		return 0;
+	}
+
+	if (globalThis.navigator.userAgentData) {
 		const brand = navigator.userAgentData.brands.find(({brand}) => brand === 'Chromium');
-		if (brand && brand.version > 93) {
+		if (brand?.version > 93) {
 			return 3;
 		}
 	}
 
-	if (/\b(Chrome|Chromium)\//.test(navigator.userAgent)) {
+	if (/\b(Chrome|Chromium)\//.test(globalThis.navigator.userAgent)) {
 		return 1;
 	}
 
diff --git a/source/vendor/supports-color/index.js b/source/vendor/supports-color/index.js
index 1388372..b22d50e 100644
--- a/source/vendor/supports-color/index.js
+++ b/source/vendor/supports-color/index.js
@@ -31,17 +31,29 @@ if (
 }
 
 function envForceColor() {
-	if ('FORCE_COLOR' in env) {
-		if (env.FORCE_COLOR === 'true') {
-			return 1;
-		}
-
-		if (env.FORCE_COLOR === 'false') {
-			return 0;
-		}
-
-		return env.FORCE_COLOR.length === 0 ? 1 : Math.min(Number.parseInt(env.FORCE_COLOR, 10), 3);
+	if (!('FORCE_COLOR' in env)) {
+		return;
 	}
+
+	if (env.FORCE_COLOR === 'true') {
+		return 1;
+	}
+
+	if (env.FORCE_COLOR === 'false') {
+		return 0;
+	}
+
+	if (env.FORCE_COLOR.length === 0) {
+		return 1;
+	}
+
+	const level = Math.min(Number.parseInt(env.FORCE_COLOR, 10), 3);
+
+	if (![0, 1, 2, 3].includes(level)) {
+		return;
+	}
+
+	return level;
 }
 
 function translateLevel(level) {