diff --git a/index.js b/index.js
index 917c45f..4c10b8b 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,4 @@
 'use strict';
-const escapeStringRegexp = require('escape-string-regexp');
 const ansiStyles = require('ansi-styles');
 const stdoutColor = require('supports-color').stdout;
 
@@ -15,6 +14,10 @@ const skipModels = new Set(['gray']);
 
 const styles = Object.create(null);
 
+function escapeStringRegexp(str) {
+	return str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 function applyOptions(obj, options = {}) {
 	if (options.level > 3 || options.level < 0) {
 		throw new Error('The `level` option should be an integer from 0 to 3');
diff --git a/package.json b/package.json
index 32c6f73..99e57f7 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,6 @@
 	],
 	"dependencies": {
 		"ansi-styles": "^3.2.1",
-		"escape-string-regexp": "^1.0.5",
 		"supports-color": "^5.5.0"
 	},
 	"devDependencies": {