diff --git a/package.json b/package.json
index dd25d397..46c5c95d 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "accoutrement",
   "title": "Accoutrement",
-  "version": "4.0.0-beta.3",
+  "version": "4.0.0-rc.1",
   "description": "Sass design-systems management and utilities.",
   "homepage": "https://www.oddbird.net/accoutrement/",
   "type": "module",
@@ -48,9 +48,9 @@
     "chokidar-cli": "^3.0.0",
     "mocha": "^9.2.1",
     "npm-run-all": "^4.1.5",
-    "postcss": "^8.4.6",
+    "postcss": "^8.4.7",
     "prettier": "^2.5.1",
-    "sass": "^1.49.8",
+    "sass": "^1.49.9",
     "sass-true": "^6.1.0-beta.1",
     "sassdoc": "^2.7.3",
     "sassdoc-theme-herman": "^4.0.2",
diff --git a/yarn.lock b/yarn.lock
index af65f08a..b86e9e39 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2333,7 +2333,7 @@ nanoid@3.2.0:
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.2.0.tgz#62667522da6673971cca916a6d3eff3f415ff80c"
   integrity sha512-fmsZYa9lpn69Ad5eDn7FMcnnSR+8R34W9qJEijxYhTbfOWzr22n1QxCMzXLK+ODyW2973V3Fux959iQoUxzUIA==
 
-nanoid@^3.2.0:
+nanoid@^3.3.1:
   version "3.3.1"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.1.tgz#6347a18cac88af88f58af0b3594b723d5e99bb35"
   integrity sha512-n6Vs/3KGyxPQd6uO0eH4Bv0ojGSUvuLlIHtC3Y0kEO23YRge8H9x1GCzLn28YX0H66pMkxuaeESFq4tKISKwdw==
@@ -2688,12 +2688,12 @@ postcss-value-parser@^4.1.0, postcss-value-parser@^4.2.0:
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz#723c09920836ba6d3e5af019f92bc0971c02e514"
   integrity sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==
 
-postcss@^8.4.6:
-  version "8.4.6"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.6.tgz#c5ff3c3c457a23864f32cb45ac9b741498a09ae1"
-  integrity sha512-OovjwIzs9Te46vlEx7+uXB0PLijpwjXGKXjVGGPIGubGpq7uh5Xgf6D6FiJ/SzJMBosHDp6a2hiXOS97iBXcaA==
+postcss@^8.4.6, postcss@^8.4.7:
+  version "8.4.7"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.7.tgz#f99862069ec4541de386bf57f5660a6c7a0875a8"
+  integrity sha512-L9Ye3r6hkkCeOETQX6iOaWZgjp3LL6Lpqm6EtgbKrgqGGteRMNb9vzBfRL96YOSu8o7x3MfIH9Mo5cPJFGrW6A==
   dependencies:
-    nanoid "^3.2.0"
+    nanoid "^3.3.1"
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
@@ -3053,10 +3053,10 @@ sass-true@^6.1.0-beta.1:
     jest-diff "^27.5.1"
     lodash "^4.17.21"
 
-sass@^1.49.8:
-  version "1.49.8"
-  resolved "https://registry.yarnpkg.com/sass/-/sass-1.49.8.tgz#9bbbc5d43d14862db07f1c04b786c9da9b641828"
-  integrity sha512-NoGOjvDDOU9og9oAxhRnap71QaTjjlzrvLnKecUJ3GxhaQBrV6e7gPuSPF28u1OcVAArVojPAe4ZhOXwwC4tGw==
+sass@^1.49.9:
+  version "1.49.9"
+  resolved "https://registry.yarnpkg.com/sass/-/sass-1.49.9.tgz#b15a189ecb0ca9e24634bae5d1ebc191809712f9"
+  integrity sha512-YlYWkkHP9fbwaFRZQRXgDi3mXZShslVmmo+FVK3kHLUELHHEYrCmL1x6IUjC7wLS6VuJSAFXRQS/DxdsC4xL1A==
   dependencies:
     chokidar ">=3.0.0 <4.0.0"
     immutable "^4.0.0"