diff --git a/package.json b/package.json
index 2b755fbdba..2c8e50c226 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,6 @@
     "postcss-import": "^15.0.0",
     "postcss-loader": "^7.0.0",
     "postcss-media-minmax": "https://codeload.github.com/andersk/postcss-media-minmax/tar.gz/92c4dd33b9add115ec436ef25243484cca0f7355",
-    "postcss-mixins": "^9.0.1",
     "postcss-prefixwrap": "^1.24.0",
     "postcss-preset-env": "^8.0.1",
     "postcss-simple-vars": "^7.0.0",
diff --git a/stylelint.config.js b/stylelint.config.js
index 5e8673d3d2..614fe9416d 100644
--- a/stylelint.config.js
+++ b/stylelint.config.js
@@ -4,7 +4,7 @@ module.exports = {
     extends: ["stylelint-config-standard", "stylelint-config-prettier"],
     rules: {
         // Add some exceptions for recommended rules
-        "at-rule-no-unknown": [true, {ignoreAtRules: ["extend", "define-mixin", "mixin"]}],
+        "at-rule-no-unknown": [true, {ignoreAtRules: ["extend"]}],
         "font-family-no-missing-generic-family-keyword": [
             true,
             {ignoreFontFamilies: ["FontAwesome"]},
diff --git a/yarn.lock b/yarn.lock
index 2002984894..0e3fd4ce42 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3303,11 +3303,6 @@ camel-case@^4.1.2:
     pascal-case "^3.1.2"
     tslib "^2.0.3"
 
-camelcase-css@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/camelcase-css/-/camelcase-css-2.0.1.tgz#ee978f6947914cc30c6b44741b6ed1df7f043fd5"
-  integrity sha512-QOSvevhslijgYwRx6Rv7zKdMF8lbRmx+uQGx2+vDc+KI/eBnsy9kit5aj23AgGu3pa4t9AgwbnXWqS+iOY+2aA==
-
 camelcase-keys@^6.2.2:
   version "6.2.2"
   resolved "https://registry.yarnpkg.com/camelcase-keys/-/camelcase-keys-6.2.2.tgz#5e755d6ba51aa223ec7d3d52f25778210f9dc3c0"
@@ -5251,7 +5246,7 @@ fast-deep-equal@^3.1.1, fast-deep-equal@^3.1.3:
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
   integrity sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==
 
-fast-glob@^3.2.11, fast-glob@^3.2.12, fast-glob@^3.2.9:
+fast-glob@^3.2.12, fast-glob@^3.2.9:
   version "3.2.12"
   resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-3.2.12.tgz#7f39ec99c2e6ab030337142da9e0c18f37afae80"
   integrity sha512-DVj4CQIYYow0BlaelwK1pHl5n5cRSJfM60UA0zK891sVInoPri2Ekj7+e1CT3/3qxXenpI+nBBmQAcJPJgaj4w==
@@ -8703,13 +8698,6 @@ postcss-initial@^4.0.1:
   resolved "https://registry.yarnpkg.com/postcss-initial/-/postcss-initial-4.0.1.tgz#529f735f72c5724a0fb30527df6fb7ac54d7de42"
   integrity sha512-0ueD7rPqX8Pn1xJIjay0AZeIuDoF+V+VvMt/uOnn+4ezUKhZM/NokDeP6DwMNyIoYByuN/94IQnt5FEkaN59xQ==
 
-postcss-js@^4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/postcss-js/-/postcss-js-4.0.1.tgz#61598186f3703bab052f1c4f7d805f3991bee9d2"
-  integrity sha512-dDLF8pEO191hJMtlHFPRa8xsizHaM82MLfNkUHdUtVEV3tgTp5oj+8qbEqYM57SLfc74KSbw//4SeJma2LRVIw==
-  dependencies:
-    camelcase-css "^2.0.1"
-
 postcss-lab-function@^5.0.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/postcss-lab-function/-/postcss-lab-function-5.1.0.tgz#ed3822feb0f7ff229e6d185929583b16861f7753"
@@ -8794,16 +8782,6 @@ postcss-minify-selectors@^5.2.1:
   dependencies:
     postcss-selector-parser "^6.0.5"
 
-postcss-mixins@^9.0.1:
-  version "9.0.4"
-  resolved "https://registry.yarnpkg.com/postcss-mixins/-/postcss-mixins-9.0.4.tgz#75cd3cdb619a7e08c4c51ebb094db5f6d65b3831"
-  integrity sha512-XVq5jwQJDRu5M1XGkdpgASqLk37OqkH4JCFDXl/Dn7janOJjCTEKL+36cnRVy7bMtoBzALfO7bV7nTIsFnUWLA==
-  dependencies:
-    fast-glob "^3.2.11"
-    postcss-js "^4.0.0"
-    postcss-simple-vars "^7.0.0"
-    sugarss "^4.0.1"
-
 postcss-modules-extract-imports@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/postcss-modules-extract-imports/-/postcss-modules-extract-imports-3.0.0.tgz#cda1f047c0ae80c97dbe28c3e76a43b88025741d"
@@ -10437,11 +10415,6 @@ stylis@4.1.3:
   resolved "https://registry.yarnpkg.com/stylis/-/stylis-4.1.3.tgz#fd2fbe79f5fed17c55269e16ed8da14c84d069f7"
   integrity sha512-GP6WDNWf+o403jrEp9c5jibKavrtLW+/qYGhFxFrG8maXhwTBI7gLLhiBb0o7uFccWN+EOS9aMO6cGHWAO07OA==
 
-sugarss@^4.0.1:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/sugarss/-/sugarss-4.0.1.tgz#128a783ed71ee0fc3b489ce1f7d5a89bc1e24383"
-  integrity sha512-WCjS5NfuVJjkQzK10s8WOBY+hhDxxNt/N6ZaGwxFZ+wN3/lKKFSaaKUNecULcTTvE4urLcKaZFQD8vO0mOZujw==
-
 supercluster@^7.0.0:
   version "7.1.5"
   resolved "https://registry.yarnpkg.com/supercluster/-/supercluster-7.1.5.tgz#65a6ce4a037a972767740614c19051b64b8be5a3"