diff --git a/addon/styles/helpers/index.css b/addon/styles/helpers/index.css
index 3acb4117..f1402231 100644
--- a/addon/styles/helpers/index.css
+++ b/addon/styles/helpers/index.css
@@ -1,9 +1,9 @@
-@import 'helpers/unstyled.css';
-@import 'helpers/embed.css';
-@import 'helpers/flex.css';
-@import 'helpers/margin.css';
-@import 'helpers/padding.css';
-@import 'helpers/rounded.css';
+@import './unstyled.css';
+@import './embed.css';
+@import './flex.css';
+@import './margin.css';
+@import './padding.css';
+@import './rounded.css';
 
 .img-fluid {
   width: 100%;
diff --git a/index.js b/index.js
index 1b5e132e..bc397cbf 100644
--- a/index.js
+++ b/index.js
@@ -2,21 +2,41 @@
 'use strict';
 const Funnel = require('broccoli-funnel');
 const path = require('path');
-const staticPostcssAddonTree = require('static-postcss-addon-tree');
+const CssImport = require('postcss-import')
+const PresetEnv = require('postcss-preset-env');
+
+const plugins = [
+  { module: CssImport },
+  {
+    module: PresetEnv,
+    options: {
+      stage: 3,
+      features: { 'nesting-rules': true },
+    }
+  }
+];
 
 module.exports = {
   name: require('./package').name,
 
-  options: {},
-
-  treeForAddon() {
-    var tree = this._super(...arguments);
+  options: {
+    postcssOptions: {
+      compile: {
+        enabled: true,
+        plugins,
+      }
+    }
+  },
 
-    return staticPostcssAddonTree(tree, {
-      addonName: 'ember-styleguide',
-      addonFolder: __dirname,
-      project: this.project || this.app.project
-    });
+  included: function(app) {
+    this._super.included.apply(this, arguments);
+    app.options = app.options || {};
+    app.options.postcssOptions = {
+      compile: {
+        enabled: true,
+        plugins,
+      }
+    }
   },
 
   treeForPublic: function() {
diff --git a/package-lock.json b/package-lock.json
index a1975331..1dc2707e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,21 +1,21 @@
 {
   "name": "ember-styleguide",
-  "version": "11.0.0",
+  "version": "11.0.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "ember-styleguide",
-      "version": "11.0.0",
+      "version": "11.0.2",
       "license": "MIT",
       "dependencies": {
         "@ember/render-modifiers": "^2.0.2",
         "@glimmer/component": "^1.0.4",
         "broccoli-funnel": "^3.0.2",
         "broccoli-merge-trees": "^4.2.0",
-        "broccoli-postcss": "^5.1.0",
         "ember-cli-babel": "^7.26.10",
         "ember-cli-htmlbars": "^5.7.2",
+        "ember-cli-postcss": "^8.2.0",
         "ember-concurrency": "^2.2.0",
         "ember-named-blocks-polyfill": "^0.2.5",
         "ember-test-waiters": "^2.1.3",
@@ -2454,34 +2454,6 @@
         }
       }
     },
-    "node_modules/@embroider/core/node_modules/broccoli-output-wrapper": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.5.tgz",
-      "integrity": "sha512-bQAtwjSrF4Nu0CK0JOy5OZqw9t5U0zzv2555EA/cF8/a8SLDTIetk9UgrtMVw7qKLKdSpOZ2liZNeZZDaKgayw==",
-      "dev": true,
-      "dependencies": {
-        "fs-extra": "^8.1.0",
-        "heimdalljs-logger": "^0.1.10",
-        "symlink-or-copy": "^1.2.0"
-      },
-      "engines": {
-        "node": "10.* || >= 12.*"
-      }
-    },
-    "node_modules/@embroider/core/node_modules/broccoli-output-wrapper/node_modules/fs-extra": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
-      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
-      "dev": true,
-      "dependencies": {
-        "graceful-fs": "^4.2.0",
-        "jsonfile": "^4.0.0",
-        "universalify": "^0.1.0"
-      },
-      "engines": {
-        "node": ">=6 <7 || >=8"
-      }
-    },
     "node_modules/@embroider/core/node_modules/broccoli-persistent-filter": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/broccoli-persistent-filter/-/broccoli-persistent-filter-3.1.2.tgz",
@@ -8101,7 +8073,6 @@
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/broccoli-caching-writer/-/broccoli-caching-writer-3.0.3.tgz",
       "integrity": "sha1-C9LJapc41qarWQ8HujXFFX19tHY=",
-      "dev": true,
       "dependencies": {
         "broccoli-kitchen-sink-helpers": "^0.3.1",
         "broccoli-plugin": "^1.2.1",
@@ -8115,7 +8086,6 @@
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
       "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-      "dev": true,
       "dependencies": {
         "ms": "2.0.0"
       }
@@ -8123,14 +8093,12 @@
     "node_modules/broccoli-caching-writer/node_modules/ms": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
-      "dev": true
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
     },
     "node_modules/broccoli-caching-writer/node_modules/rsvp": {
       "version": "3.6.2",
       "resolved": "https://registry.npmjs.org/rsvp/-/rsvp-3.6.2.tgz",
       "integrity": "sha512-OfWGQTb9vnwRjwtA2QwpG2ICclHC3pgXZO5xt8H2EfgDquO0qVdSb5T88L4qJVAEugbS56pAuV4XZM58UX8ulw==",
-      "dev": true,
       "engines": {
         "node": "0.12.* || 4.* || 6.* || >= 7.*"
       }
@@ -8346,19 +8314,6 @@
       "integrity": "sha1-ETZbKnha7JsXlyo234fu8kxcwOo=",
       "dev": true
     },
-    "node_modules/broccoli-funnel/node_modules/broccoli-output-wrapper": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.5.tgz",
-      "integrity": "sha512-bQAtwjSrF4Nu0CK0JOy5OZqw9t5U0zzv2555EA/cF8/a8SLDTIetk9UgrtMVw7qKLKdSpOZ2liZNeZZDaKgayw==",
-      "dependencies": {
-        "fs-extra": "^8.1.0",
-        "heimdalljs-logger": "^0.1.10",
-        "symlink-or-copy": "^1.2.0"
-      },
-      "engines": {
-        "node": "10.* || >= 12.*"
-      }
-    },
     "node_modules/broccoli-funnel/node_modules/broccoli-plugin": {
       "version": "4.0.7",
       "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-4.0.7.tgz",
@@ -8376,19 +8331,6 @@
         "node": "10.* || >= 12.*"
       }
     },
-    "node_modules/broccoli-funnel/node_modules/fs-extra": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
-      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
-      "dependencies": {
-        "graceful-fs": "^4.2.0",
-        "jsonfile": "^4.0.0",
-        "universalify": "^0.1.0"
-      },
-      "engines": {
-        "node": ">=6 <7 || >=8"
-      }
-    },
     "node_modules/broccoli-funnel/node_modules/fs-tree-diff": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/fs-tree-diff/-/fs-tree-diff-2.0.1.tgz",
@@ -8487,19 +8429,6 @@
         "node": "10.* || >= 12.*"
       }
     },
-    "node_modules/broccoli-merge-trees/node_modules/broccoli-output-wrapper": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.1.tgz",
-      "integrity": "sha512-mhOTy8AyzEsqgefR2ejbv5QTy3dbY2bvDfkARo55Xml52r2MU0CehQu4T/CH6oPcAXkdVYG/hGm9UpV1vU9Ohg==",
-      "dependencies": {
-        "fs-extra": "^8.1.0",
-        "heimdalljs-logger": "^0.1.10",
-        "symlink-or-copy": "^1.2.0"
-      },
-      "engines": {
-        "node": "10.* || >= 12.*"
-      }
-    },
     "node_modules/broccoli-merge-trees/node_modules/broccoli-plugin": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-4.0.2.tgz",
@@ -8517,19 +8446,6 @@
         "node": "10.* || >= 12.*"
       }
     },
-    "node_modules/broccoli-merge-trees/node_modules/fs-extra": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
-      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
-      "dependencies": {
-        "graceful-fs": "^4.2.0",
-        "jsonfile": "^4.0.0",
-        "universalify": "^0.1.0"
-      },
-      "engines": {
-        "node": ">=6 <7 || >=8"
-      }
-    },
     "node_modules/broccoli-merge-trees/node_modules/rimraf": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
@@ -8590,6 +8506,34 @@
         "node": "8.* || >= 10.*"
       }
     },
+    "node_modules/broccoli-output-wrapper": {
+      "version": "3.2.5",
+      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.5.tgz",
+      "integrity": "sha512-bQAtwjSrF4Nu0CK0JOy5OZqw9t5U0zzv2555EA/cF8/a8SLDTIetk9UgrtMVw7qKLKdSpOZ2liZNeZZDaKgayw==",
+      "license": "MIT",
+      "dependencies": {
+        "fs-extra": "^8.1.0",
+        "heimdalljs-logger": "^0.1.10",
+        "symlink-or-copy": "^1.2.0"
+      },
+      "engines": {
+        "node": "10.* || >= 12.*"
+      }
+    },
+    "node_modules/broccoli-output-wrapper/node_modules/fs-extra": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
+      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
+      "license": "MIT",
+      "dependencies": {
+        "graceful-fs": "^4.2.0",
+        "jsonfile": "^4.0.0",
+        "universalify": "^0.1.0"
+      },
+      "engines": {
+        "node": ">=6 <7 || >=8"
+      }
+    },
     "node_modules/broccoli-persistent-filter": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/broccoli-persistent-filter/-/broccoli-persistent-filter-2.3.1.tgz",
@@ -8665,6 +8609,63 @@
         "node": ">= 10"
       }
     },
+    "node_modules/broccoli-postcss-single": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/broccoli-postcss-single/-/broccoli-postcss-single-5.0.2.tgz",
+      "integrity": "sha512-r4eWtz/5uihtHwOszViWwV6weJr9VryvaqtVo1DOh4gL+TbTyU+NX+Y+t9TqUw99OtuivMz4uHLLH7zZECbZmw==",
+      "license": "MIT",
+      "dependencies": {
+        "broccoli-caching-writer": "^3.0.3",
+        "include-path-searcher": "^0.1.0",
+        "minimist": ">=1.2.5",
+        "mkdirp": "^1.0.3",
+        "object-assign": "^4.1.1",
+        "postcss": "^8.1.4"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/broccoli-postcss-single/node_modules/mkdirp": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
+      "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==",
+      "license": "MIT",
+      "bin": {
+        "mkdirp": "bin/cmd.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/broccoli-postcss-single/node_modules/postcss": {
+      "version": "8.4.39",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.39.tgz",
+      "integrity": "sha512-0vzE+lAiG7hZl1/9I8yzKLx3aR9Xbof3fBHKunvMfOCYAtMhrsnccJY2iTURb9EZd5+pLuiNV9/c/GZJOHsgIw==",
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/postcss/"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/postcss"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "nanoid": "^3.3.7",
+        "picocolors": "^1.0.1",
+        "source-map-js": "^1.2.0"
+      },
+      "engines": {
+        "node": "^10 || ^12 || >=14"
+      }
+    },
     "node_modules/broccoli-rollup": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/broccoli-rollup/-/broccoli-rollup-2.1.1.tgz",
@@ -9119,20 +9120,6 @@
         "node": ">=0.4.0"
       }
     },
-    "node_modules/broccoli-terser-sourcemap/node_modules/broccoli-output-wrapper": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.5.tgz",
-      "integrity": "sha512-bQAtwjSrF4Nu0CK0JOy5OZqw9t5U0zzv2555EA/cF8/a8SLDTIetk9UgrtMVw7qKLKdSpOZ2liZNeZZDaKgayw==",
-      "dev": true,
-      "dependencies": {
-        "fs-extra": "^8.1.0",
-        "heimdalljs-logger": "^0.1.10",
-        "symlink-or-copy": "^1.2.0"
-      },
-      "engines": {
-        "node": "10.* || >= 12.*"
-      }
-    },
     "node_modules/broccoli-terser-sourcemap/node_modules/broccoli-plugin": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-4.0.3.tgz",
@@ -9151,20 +9138,6 @@
         "node": "10.* || >= 12.*"
       }
     },
-    "node_modules/broccoli-terser-sourcemap/node_modules/fs-extra": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
-      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
-      "dev": true,
-      "dependencies": {
-        "graceful-fs": "^4.2.0",
-        "jsonfile": "^4.0.0",
-        "universalify": "^0.1.0"
-      },
-      "engines": {
-        "node": ">=6 <7 || >=8"
-      }
-    },
     "node_modules/broccoli-terser-sourcemap/node_modules/matcher-collection": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/matcher-collection/-/matcher-collection-2.0.1.tgz",
@@ -12328,34 +12301,6 @@
         "node": "6.* || 8.* || >= 10.*"
       }
     },
-    "node_modules/ember-auto-import/node_modules/broccoli-output-wrapper": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.5.tgz",
-      "integrity": "sha512-bQAtwjSrF4Nu0CK0JOy5OZqw9t5U0zzv2555EA/cF8/a8SLDTIetk9UgrtMVw7qKLKdSpOZ2liZNeZZDaKgayw==",
-      "dev": true,
-      "dependencies": {
-        "fs-extra": "^8.1.0",
-        "heimdalljs-logger": "^0.1.10",
-        "symlink-or-copy": "^1.2.0"
-      },
-      "engines": {
-        "node": "10.* || >= 12.*"
-      }
-    },
-    "node_modules/ember-auto-import/node_modules/broccoli-output-wrapper/node_modules/fs-extra": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
-      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
-      "dev": true,
-      "dependencies": {
-        "graceful-fs": "^4.2.0",
-        "jsonfile": "^4.0.0",
-        "universalify": "^0.1.0"
-      },
-      "engines": {
-        "node": ">=6 <7 || >=8"
-      }
-    },
     "node_modules/ember-auto-import/node_modules/broccoli-plugin": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-4.0.3.tgz",
@@ -12948,52 +12893,6 @@
         "node": ">= 4.0.0"
       }
     },
-    "node_modules/ember-cli-fastboot/node_modules/broccoli-output-wrapper": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.5.tgz",
-      "integrity": "sha512-bQAtwjSrF4Nu0CK0JOy5OZqw9t5U0zzv2555EA/cF8/a8SLDTIetk9UgrtMVw7qKLKdSpOZ2liZNeZZDaKgayw==",
-      "dev": true,
-      "dependencies": {
-        "fs-extra": "^8.1.0",
-        "heimdalljs-logger": "^0.1.10",
-        "symlink-or-copy": "^1.2.0"
-      },
-      "engines": {
-        "node": "10.* || >= 12.*"
-      }
-    },
-    "node_modules/ember-cli-fastboot/node_modules/broccoli-output-wrapper/node_modules/fs-extra": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
-      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
-      "dev": true,
-      "dependencies": {
-        "graceful-fs": "^4.2.0",
-        "jsonfile": "^4.0.0",
-        "universalify": "^0.1.0"
-      },
-      "engines": {
-        "node": ">=6 <7 || >=8"
-      }
-    },
-    "node_modules/ember-cli-fastboot/node_modules/broccoli-output-wrapper/node_modules/jsonfile": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
-      "integrity": "sha512-m6F1R3z8jjlf2imQHS2Qez5sjKWQzbuuhuJ/FKYFRZvPE3PuHcSMVZzfsLhGVOkfd20obL5SWEBew5ShlquNxg==",
-      "dev": true,
-      "optionalDependencies": {
-        "graceful-fs": "^4.1.6"
-      }
-    },
-    "node_modules/ember-cli-fastboot/node_modules/broccoli-output-wrapper/node_modules/universalify": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
-      "dev": true,
-      "engines": {
-        "node": ">= 4.0.0"
-      }
-    },
     "node_modules/ember-cli-fastboot/node_modules/broccoli-plugin": {
       "version": "4.0.7",
       "resolved": "https://registry.npmjs.org/broccoli-plugin/-/broccoli-plugin-4.0.7.tgz",
@@ -13377,19 +13276,6 @@
         "node": "8.* || >= 10.*"
       }
     },
-    "node_modules/ember-cli-htmlbars/node_modules/broccoli-output-wrapper": {
-      "version": "3.2.5",
-      "resolved": "https://registry.npmjs.org/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.5.tgz",
-      "integrity": "sha512-bQAtwjSrF4Nu0CK0JOy5OZqw9t5U0zzv2555EA/cF8/a8SLDTIetk9UgrtMVw7qKLKdSpOZ2liZNeZZDaKgayw==",
-      "dependencies": {
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@@ -49003,16 +48965,6 @@
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@@ -53391,6 +53343,11 @@
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+    },
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@@ -55184,6 +55141,11 @@
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+      "resolved": "https://registry.npmjs.org/merge/-/merge-2.1.1.tgz",
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@@ -55675,10 +55637,9 @@
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@@ -56680,9 +56641,9 @@
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+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.0.1.tgz",
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@@ -57330,17 +57291,6 @@
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@@ -59270,10 +59209,9 @@
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+      "version": "1.2.0",
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diff --git a/package.json b/package.json
index 979a98d4..858dee3d 100644
--- a/package.json
+++ b/package.json
@@ -37,9 +37,9 @@
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     "ember-cli-babel": "^7.26.10",
     "ember-cli-htmlbars": "^5.7.2",
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     "ember-concurrency": "^2.2.0",
     "ember-named-blocks-polyfill": "^0.2.5",
     "ember-test-waiters": "^2.1.3",
@@ -118,6 +118,9 @@
     "registry": "https://registry.npmjs.org"
   },
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+      "ember-cli-postcss"
+    ],
     "edition": "octane"
   },
   "ember-addon": {