diff --git a/package.json b/package.json
index 7539a31..247f6e5 100644
--- a/package.json
+++ b/package.json
@@ -25,8 +25,7 @@
   "license": "Apache-2.0",
   "repository": "https://github.com/google/postcss-rename",
   "dependencies": {
-    "postcss": "^7.0.18",
-    "postcss-selector-parser": "^6.0.2"
+    "postcss-selector-parser": "^6.0.4"
   },
   "devDependencies": {
     "@babel/cli": "^7.6.0",
@@ -40,9 +39,13 @@
     "gts": "2.0.0",
     "jest": "^24.9.0",
     "jest-cli": "^24.9.0",
+    "postcss": "^8.2.6",
     "ts-jest": "^24.2.0",
     "typescript": "^3.8.0"
   },
+  "peerDependencies": {
+    "postcss": "^8.2.6"
+  },
   "engines": {
     "node": ">=8.3.0"
   }
diff --git a/src/index.ts b/src/index.ts
index ed80828..c7001ce 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -15,7 +15,6 @@
  * limitations under the License.
  */
 
-import * as postcss from 'postcss';
 import selectorParser from 'postcss-selector-parser';
 
 import {MinimalRenamer} from './minimal-renamer';
@@ -33,19 +32,19 @@ namespace plugin {
 }
 
 // eslint-disable-next-line no-redeclare
-const plugin = postcss.plugin(
-  'postcss-rename',
-  ({
-    strategy = 'none',
-    by = 'whole',
-    prefix = '',
-    except = [],
-    ids = false,
-    outputMapCallback,
-  }: plugin.Options = {}) => {
-    const exceptSet = new Set(except);
-    return (root: postcss.Root): void => {
-      if (strategy === 'none' && !outputMapCallback && !prefix) return;
+const plugin = ({
+  strategy = 'none',
+  by = 'whole',
+  prefix = '',
+  except = [],
+  ids = false,
+  outputMapCallback,
+}: plugin.Options = {}) => {
+  const exceptSet = new Set(except);
+  return {
+    postcssPlugin: 'postcss-rename',
+    prepare() {
+      if (strategy === 'none' && !outputMapCallback && !prefix) return {};
 
       const outputMap: {[key: string]: string} | null = outputMapCallback
         ? {}
@@ -97,11 +96,16 @@ const plugin = postcss.plugin(
         if (ids) selectors.walkIds(renameNode);
       });
 
-      root.walkRules(ruleNode => selectorProcessor.process(ruleNode));
-
-      if (outputMapCallback) outputMapCallback(outputMap);
-    };
-  }
-);
+      return {
+        Rule(ruleNode) {
+          selectorProcessor.process(ruleNode);
+        },
+        OnceExit() {
+          if (outputMapCallback) outputMapCallback(outputMap);
+        },
+      };
+    },
+  };
+};
 
 export = plugin;
diff --git a/test/index.test.ts b/test/index.test.ts
index f0b0394..581e925 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -16,17 +16,14 @@
  */
 
 import plugin = require('../src');
-import postcss from 'postcss';
+import postcss, {Result} from 'postcss';
 import {toShortName} from '../src/minimal-renamer';
 
-async function run(
-  input: string,
-  options?: plugin.Options
-): Promise<postcss.Result> {
+async function run(input: string, options?: plugin.Options): Promise<Result> {
   return await postcss([plugin(options)]).process(input, {from: undefined});
 }
 
-function assertPostcss(result: postcss.Result, output: string): void {
+function assertPostcss(result: Result, output: string): void {
   expect(result.css).toEqual(output);
   expect(result.warnings()).toHaveLength(0);
 }
diff --git a/yarn.lock b/yarn.lock
index bb94681..1bceae7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1686,6 +1686,11 @@ color-name@~1.1.4:
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.4.tgz#c2a09a87acbde69543de6f63fa3995c826c536a2"
   integrity sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==
 
+colorette@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.1.tgz#4d0b921325c14faf92633086a536db6e89564b1b"
+  integrity sha512-puCDz0CzydiSYOrnXpz/PKd69zRrribezjtE9yd4zvytoRc8+RY/KJPvtPFKZS3E3wP6neGyMe0vOTlHO5L3Pw==
+
 combined-stream@^1.0.6, combined-stream@~1.0.6:
   version "1.0.8"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.8.tgz#c3d45a8b34fd730631a110a8a2520682b31d5a7f"
@@ -3810,6 +3815,11 @@ nan@^2.12.1:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.0.tgz#7818f722027b2459a86f0295d434d1fc2336c52c"
   integrity sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==
 
+nanoid@^3.1.20:
+  version "3.1.20"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.20.tgz#badc263c6b1dcf14b71efaa85f6ab4c1d6cfc788"
+  integrity sha512-a1cQNyczgKbLX9jwbS/+d7W8fX/RfgYR7lVWwWOGIPNgK2m0MWvrGF6/m4kk6U3QcFMnZf3RIhL0v2Jgh/0Uxw==
+
 nanomatch@^1.2.9:
   version "1.2.13"
   resolved "https://registry.yarnpkg.com/nanomatch/-/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
@@ -4177,23 +4187,24 @@ posix-character-classes@^0.1.0:
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
   integrity sha1-AerA/jta9xoqbAL+q7jB/vfgDqs=
 
-postcss-selector-parser@^6.0.2:
-  version "6.0.2"
-  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.2.tgz#934cf799d016c83411859e09dcecade01286ec5c"
-  integrity sha512-36P2QR59jDTOAiIkqEprfJDsoNrvwFei3eCqKd1Y0tUsBimsq39BLp7RD+JWny3WgB1zGhJX8XVePwm9k4wdBg==
+postcss-selector-parser@^6.0.4:
+  version "6.0.4"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.4.tgz#56075a1380a04604c38b063ea7767a129af5c2b3"
+  integrity sha512-gjMeXBempyInaBqpp8gODmwZ52WaYsVOsfr4L4lDQ7n3ncD6mEyySiDtgzCT+NYC0mmeOLvtsF8iaEf0YT6dBw==
   dependencies:
     cssesc "^3.0.0"
     indexes-of "^1.0.1"
     uniq "^1.0.1"
+    util-deprecate "^1.0.2"
 
-postcss@^7.0.18:
-  version "7.0.27"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.27.tgz#cc67cdc6b0daa375105b7c424a85567345fc54d9"
-  integrity sha512-WuQETPMcW9Uf1/22HWUWP9lgsIC+KEHg2kozMflKjbeUtw9ujvFX6QmIfozaErDkmLWS9WEnEdEe6Uo9/BNTdQ==
+postcss@^8.2.6:
+  version "8.2.6"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.6.tgz#5d69a974543b45f87e464bc4c3e392a97d6be9fe"
+  integrity sha512-xpB8qYxgPuly166AGlpRjUdEYtmOWx2iCwGmrv4vqZL9YPVviDVPZPRXxnXr6xPZOdxQ9lp3ZBFCRgWJ7LE3Sg==
   dependencies:
-    chalk "^2.4.2"
+    colorette "^1.2.1"
+    nanoid "^3.1.20"
     source-map "^0.6.1"
-    supports-color "^6.1.0"
 
 prelude-ls@~1.1.2:
   version "1.1.2"
@@ -5331,7 +5342,7 @@ use@^3.1.0:
   resolved "https://registry.yarnpkg.com/use/-/use-3.1.1.tgz#d50c8cac79a19fbc20f2911f56eb973f4e10070f"
   integrity sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==
 
-util-deprecate@~1.0.1:
+util-deprecate@^1.0.2, util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
   integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=