diff --git a/package.json b/package.json
index 468b1634e..aec4487bf 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,6 @@
     "camelcase": "^6.2.0",
     "chalk": "^4.1.0",
     "cross-env": "^7.0.3",
-    "css-color-names": "^1.0.1",
     "diff": "^5.0.0",
     "eslint": "^7.32.0",
     "eslint-config-prettier": "^8.3.0",
diff --git a/packages/postcss-merge-longhand/package.json b/packages/postcss-merge-longhand/package.json
index 4401d71a9..b0b9b6d07 100644
--- a/packages/postcss-merge-longhand/package.json
+++ b/packages/postcss-merge-longhand/package.json
@@ -28,7 +28,6 @@
   },
   "repository": "cssnano/cssnano",
   "dependencies": {
-    "css-color-names": "^1.0.1",
     "postcss-value-parser": "^4.1.0",
     "stylehacks": "^5.0.1"
   },
diff --git a/packages/postcss-merge-longhand/src/lib/colornames.js b/packages/postcss-merge-longhand/src/lib/colornames.js
new file mode 100644
index 000000000..d477dcaf5
--- /dev/null
+++ b/packages/postcss-merge-longhand/src/lib/colornames.js
@@ -0,0 +1,151 @@
+/* https://www.w3.org/TR/css-color-4/#named-colors */
+export default [
+  'aliceblue',
+  'antiquewhite',
+  'aqua',
+  'aquamarine',
+  'azure',
+  'beige',
+  'bisque',
+  'black',
+  'blanchedalmond',
+  'blue',
+  'blueviolet',
+  'brown',
+  'burlywood',
+  'cadetblue',
+  'chartreuse',
+  'chocolate',
+  'coral',
+  'cornflowerblue',
+  'cornsilk',
+  'crimson',
+  'cyan',
+  'darkblue',
+  'darkcyan',
+  'darkgoldenrod',
+  'darkgray',
+  'darkgreen',
+  'darkgrey',
+  'darkkhaki',
+  'darkmagenta',
+  'darkolivegreen',
+  'darkorange',
+  'darkorchid',
+  'darkred',
+  'darksalmon',
+  'darkseagreen',
+  'darkslateblue',
+  'darkslategray',
+  'darkslategrey',
+  'darkturquoise',
+  'darkviolet',
+  'deeppink',
+  'deepskyblue',
+  'dimgray',
+  'dimgrey',
+  'dodgerblue',
+  'firebrick',
+  'floralwhite',
+  'forestgreen',
+  'fuchsia',
+  'gainsboro',
+  'ghostwhite',
+  'gold',
+  'goldenrod',
+  'gray',
+  'green',
+  'greenyellow',
+  'grey',
+  'honeydew',
+  'hotpink',
+  'indianred',
+  'indigo',
+  'ivory',
+  'khaki',
+  'lavender',
+  'lavenderblush',
+  'lawngreen',
+  'lemonchiffon',
+  'lightblue',
+  'lightcoral',
+  'lightcyan',
+  'lightgoldenrodyellow',
+  'lightgray',
+  'lightgreen',
+  'lightgrey',
+  'lightpink',
+  'lightsalmon',
+  'lightseagreen',
+  'lightskyblue',
+  'lightslategray',
+  'lightslategrey',
+  'lightsteelblue',
+  'lightyellow',
+  'lime',
+  'limegreen',
+  'linen',
+  'magenta',
+  'maroon',
+  'mediumaquamarine',
+  'mediumblue',
+  'mediumorchid',
+  'mediumpurple',
+  'mediumseagreen',
+  'mediumslateblue',
+  'mediumspringgreen',
+  'mediumturquoise',
+  'mediumvioletred',
+  'midnightblue',
+  'mintcream',
+  'mistyrose',
+  'moccasin',
+  'navajowhite',
+  'navy',
+  'oldlace',
+  'olive',
+  'olivedrab',
+  'orange',
+  'orangered',
+  'orchid',
+  'palegoldenrod',
+  'palegreen',
+  'paleturquoise',
+  'palevioletred',
+  'papayawhip',
+  'peachpuff',
+  'peru',
+  'pink',
+  'plum',
+  'powderblue',
+  'purple',
+  'rebeccapurple',
+  'red',
+  'rosybrown',
+  'royalblue',
+  'saddlebrown',
+  'salmon',
+  'sandybrown',
+  'seagreen',
+  'seashell',
+  'sienna',
+  'silver',
+  'skyblue',
+  'slateblue',
+  'slategray',
+  'slategrey',
+  'snow',
+  'springgreen',
+  'steelblue',
+  'tan',
+  'teal',
+  'thistle',
+  'tomato',
+  'turquoise',
+  'violet',
+  'wheat',
+  'white',
+  'whitesmoke',
+  'yellow',
+  'yellowgreen',
+];
diff --git a/packages/postcss-merge-longhand/src/lib/validateWsc.js b/packages/postcss-merge-longhand/src/lib/validateWsc.js
index a137b1a73..8fe22222c 100644
--- a/packages/postcss-merge-longhand/src/lib/validateWsc.js
+++ b/packages/postcss-merge-longhand/src/lib/validateWsc.js
@@ -1,4 +1,4 @@
-import colorNames from 'css-color-names';
+import colors from './colornames.js';
 
 const widths = ['thin', 'medium', 'thick'];
 const styles = [
@@ -13,7 +13,6 @@ const styles = [
   'inset',
   'outset',
 ];
-const colors = Object.keys(colorNames);
 
 export function isStyle(value) {
   return value && !!~styles.indexOf(value.toLowerCase());
diff --git a/yarn.lock b/yarn.lock
index b8b7879c5..ff24b5b92 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2223,11 +2223,6 @@ cross-spawn@^7.0.1, cross-spawn@^7.0.2, cross-spawn@^7.0.3:
     shebang-command "^2.0.0"
     which "^2.0.1"
 
-css-color-names@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/css-color-names/-/css-color-names-1.0.1.tgz#6ff7ee81a823ad46e020fa2fd6ab40a887e2ba67"
-  integrity sha512-/loXYOch1qU1biStIFsHH8SxTmOseh1IJqFvy8IujXOm1h+QjUdDhkzOrR5HG8K8mlxREj0yfi8ewCHx0eMxzA==
-
 css-declaration-sorter@^6.0.3:
   version "6.1.3"
   resolved "https://registry.yarnpkg.com/css-declaration-sorter/-/css-declaration-sorter-6.1.3.tgz#e9852e4cf940ba79f509d9425b137d1f94438dc2"