diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71d4338..6caa7f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.2.2] - 2023-02-03
+## Fixed
+- Made `ColorConvert` accept hex values in upper case
+
 ## [1.2.1] - 2022-08-23
 ### Added
 - `LICENSE` file
diff --git a/README.md b/README.md
index 9e0d6b3..2610afd 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Interaktiv Colors
 
 [![code style: ts-standard](https://img.shields.io/badge/code%20style-ts--standard-blue)](https://standardjs.com/)
-![Version: 1.2.0](https://img.shields.io/badge/version-1.2.0-242424)
+![Version: 1.2.2](https://img.shields.io/badge/version-1.2.2-242424)
 
 Color converter for JavaScript/TypeScript.
 
diff --git a/package.json b/package.json
index b5aeeb1..21d10b0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@interaktiv.de/colors",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "Color converter for JavaScript/TypeScript",
   "keywords": [
     "color",
diff --git a/src/index.ts b/src/index.ts
index 55a78e5..dd23d99 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,7 +2,7 @@ import type { CssColorNames, RegExResult, RgbaValues } from './types'
 
 export default class ColorConvert {
   static #RGB_STRING_REGEX = /^rgb\( *(\d{1,2}|1\d{2}|2[0-4]\d|25[0-5]) +(\d{1,2}|1\d{2}|2[0-4]\d|25[0-5]) +(\d{1,2}|1\d{2}|2[0-4]\d|25[0-5]) *(\/ *(?:\d{1,2}|100)%)?\)|rgb\( *(\d{1,2}|1\d{2}|2[0-4]\d|25[0-5]) *, *(\d{1,2}|1\d{2}|2[0-4]\d|25[0-5]) *, *(\d{1,2}|1\d{2}|2[0-4]\d|25[0-5]) *\)|rgba\( *(\d{1,2}|1\d{2}|2[0-4]\d25[0-5]) *, *(\d{1,2}|1\d{2}|2[0-4]\d25[0-5]) *, *(\d{1,2}|1\d{2}|2[0-4]\d25[0-5]) *, *(0?\.\d+|1(?:\.0+)?) *\)$/
-  static #HEX_STRING_REGEX = /^#(?:([\da-f])([\da-f])([\da-f])([\da-f])?|([\da-f]{2})([\da-f]{2})([\da-f]{2})([\da-f]{2})?)$/
+  static #HEX_STRING_REGEX = /^#(?:([\da-f])([\da-f])([\da-f])([\da-f])?|([\da-f]{2})([\da-f]{2})([\da-f]{2})([\da-f]{2})?)$/i
   static #HSL_STRING_REGEX = /^hsl\( *(-?(?:\d+(?:\.\d+)?|0?\.\d+)(?:deg|g?rad|turn)?) *, *(\d{1,2}(?:\.\d+)?|100)% *, *(\d{1,2}(?:\.\d+)?|100)%*\)|hsla\( *(-?(?:\d+(?:\.\d+)?|0?\.\d+)(?:deg|g?rad|turn)?) *, *(\d{1,2}(?:\.\d+)?|100)% *, *(\d{1,2}(?:\.\d+)?|100)% *, *(0?\.\d+|1(?:\.0+)) *\)|hsl\( *(-?(?:\d+(?:\.\d+)?|0?\.\d+)(?:deg|g?rad|turn)?) +(\d{1,2}(?:\.\d+)?|100)% +(\d{1,2}(?:\.\d+)?|100)%(?: *| *\/ *((?:\d{1,2}(?:\.\d+)?|100)%|1(?:\.0+)?|0?\.\d+) *)\)$/
   static #CSS_COLORS: Record<CssColorNames, RgbaValues> = {
     black: [0, 0, 0, 1],