diff --git a/addon/package.json b/addon/package.json
index 0f5f889..bf6ab30 100644
--- a/addon/package.json
+++ b/addon/package.json
@@ -47,8 +47,8 @@
     "@storybook/components": "^6.3.4",
     "@storybook/theming": "^6.3.4",
     "polished": "^4.1.0",
-    "postcss": "^7.0.36",
-    "postcss-scss": "^2.1.1",
+    "postcss": "^8.3.5",
+    "postcss-scss": "^4.0.0",
     "raw-loader": "^4.0.2",
     "react-storage-hooks": "^4.0.1",
     "react-use-clipboard": "^1.0.7"
diff --git a/addon/src/parsers/postcss.parser.ts b/addon/src/parsers/postcss.parser.ts
index 6cb4582..5157a88 100644
--- a/addon/src/parsers/postcss.parser.ts
+++ b/addon/src/parsers/postcss.parser.ts
@@ -1,4 +1,4 @@
-import postcss, { AtRule, Comment, Declaration, PluginInitializer, Syntax } from 'postcss';
+import postcss, { AcceptedPlugin, AtRule, Comment, Declaration, OldPlugin, Plugin } from 'postcss';
 import scss from 'postcss-scss';
 
 import { Category, CategoryRange } from '../types/category.types';
@@ -180,8 +180,9 @@ async function getNodes(
   const declarations: Declaration[] = [];
   const keyframes: AtRule[] = [];
 
-  const plugin: PluginInitializer<void> = () => {
-    return (root) => {
+  const plugin: Plugin = {
+    postcssPlugin: 'storybook-design-token-parser',
+    Once(root) {
       root.walkAtRules((atRule) => {
         if (atRule.name === 'keyframes') {
           keyframes.push(atRule);
@@ -214,16 +215,17 @@ async function getNodes(
           declarations.push(declaration);
         }
       });
-    };
+    }
   };
 
   await Promise.all(
     files.map((file) => {
       const syntax: any = file.filename.endsWith('.scss') ? scss : undefined;
 
-      return postcss([
-        postcss.plugin('storybook-design-token-parser', plugin)
-      ]).process(file.content, { from: file.filename, syntax });
+      return postcss([plugin]).process(file.content, {
+        from: file.filename,
+        syntax
+      });
     })
   );
 
diff --git a/yarn.lock b/yarn.lock
index a188522..ec43c64 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9968,6 +9968,11 @@ nanoid@^3.1.20:
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.22.tgz#b35f8fb7d151990a8aebd5aa5015c03cf726f844"
   integrity sha512-/2ZUaJX2ANuLtTvqTlgqBQNJoQO398KyJgZloL0PZkC0dpysjncRUPsFe3DUPzz/y3h+u7C46np8RMuvF3jsSQ==
 
+nanoid@^3.1.23:
+  version "3.1.23"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.23.tgz#f744086ce7c2bc47ee0a8472574d5c78e4183a81"
+  integrity sha512-FiB0kzdP0FFVGDKlRLEQ1BgDzU87dy5NnzjeW9YZNt+/c3+q82EQDUwniSAUxp/F0gFNI1ZhKU1FqYsMuqZVnw==
+
 nanomatch@^1.2.9:
   version "1.2.13"
   resolved "https://registry.yarnpkg.com/nanomatch/-/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
@@ -11374,12 +11379,10 @@ postcss-safe-parser@5.0.2:
   dependencies:
     postcss "^8.1.0"
 
-postcss-scss@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/postcss-scss/-/postcss-scss-2.1.1.tgz#ec3a75fa29a55e016b90bf3269026c53c1d2b383"
-  integrity sha512-jQmGnj0hSGLd9RscFw9LyuSVAa5Bl1/KBPqG1NQw9w8ND55nY4ZEsdlVuYJvLPpV+y0nwTV5v/4rHPzZRihQbA==
-  dependencies:
-    postcss "^7.0.6"
+postcss-scss@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-scss/-/postcss-scss-4.0.0.tgz#6cfe09040f01e3345c9c226894c5913ac5fa9381"
+  integrity sha512-xakgIr5ukOEyXFcsnADKjQtrk8nQyqn5VIEAA+PmPP4kBOpknmjpJMxBNqCR1/x20AS0aSfZkWsSdbMx2Ozm5A==
 
 postcss-selector-matches@^4.0.0:
   version "4.0.0"
@@ -11499,6 +11502,15 @@ postcss@^8.1.0:
     nanoid "^3.1.20"
     source-map "^0.6.1"
 
+postcss@^8.3.5:
+  version "8.3.5"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.3.5.tgz#982216b113412bc20a86289e91eb994952a5b709"
+  integrity sha512-NxTuJocUhYGsMiMFHDUkmjSKT3EdH4/WbGF6GCi1NDGk+vbcUTun4fpbOqaPtD8IIsztA2ilZm2DhYCuyN58gA==
+  dependencies:
+    colorette "^1.2.2"
+    nanoid "^3.1.23"
+    source-map-js "^0.6.2"
+
 prelude-ls@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396"
@@ -11548,9 +11560,9 @@ pretty-hrtime@^1.0.3:
   integrity sha1-t+PqQkNaTJsnWdmeDyAesZWALuE=
 
 prismjs@^1.21.0:
-  version "1.24.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.24.0.tgz#0409c30068a6c52c89ef7f1089b3ca4de56be2ac"
-  integrity sha512-SqV5GRsNqnzCL8k5dfAjCNhUrF3pR0A9lTDSCUZeh/LIshheXJEaP0hwLz2t4XHivd2J/v2HR+gRnigzeKe3cQ==
+  version "1.24.1"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.24.1.tgz#c4d7895c4d6500289482fa8936d9cdd192684036"
+  integrity sha512-mNPsedLuk90RVJioIky8ANZEwYm5w9LcvCXrxHlwf4fNVSn8jEipMybMkWUyyF0JhnC+C4VcOVSBuHRKs1L5Ow==
 
 prismjs@~1.23.0:
   version "1.23.0"
@@ -13043,6 +13055,11 @@ source-list-map@^2.0.0, source-list-map@^2.0.1:
   resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-2.0.1.tgz#3993bd873bfc48479cca9ea3a547835c7c154b34"
   integrity sha512-qnQ7gVMxGNxsiL4lEuJwe/To8UnK7fAnmbGEEH8RpLouuKbeEm0lhbQVFIrNSuB+G7tVrAlVsZgETT5nljf+Iw==
 
+source-map-js@^0.6.2:
+  version "0.6.2"
+  resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-0.6.2.tgz#0bb5de631b41cfbda6cfba8bd05a80efdfd2385e"
+  integrity sha512-/3GptzWzu0+0MBQFrDKzw/DvvMTUORvgY6k6jd/VS6iCR4RDTKWH6v6WPwQoUO8667uQEf9Oe38DxAYWY5F/Ug==
+
 source-map-resolve@^0.5.0, source-map-resolve@^0.5.2:
   version "0.5.3"
   resolved "https://registry.yarnpkg.com/source-map-resolve/-/source-map-resolve-0.5.3.tgz#190866bece7553e1f8f267a2ee82c606b5509a1a"