diff --git a/package.json b/package.json
index 3525071..d6d6d85 100644
--- a/package.json
+++ b/package.json
@@ -84,7 +84,7 @@
     "gulp-replace": "~1.1.4",
     "gulp-sourcemaps": "~3.0.0",
     "gulp-terser": "~2.1.0",
-    "postcss": "~8.4.19",
+    "postcss": "~8.4.21",
     "postcss-preset-env": "~7.8.3",
     "stylelint": "~14.15.0",
     "stylelint-config-standard-scss": "~6.1.0"
diff --git a/yarn.lock b/yarn.lock
index 30bf1e3..fda78a3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4926,7 +4926,7 @@ postcss@^7.0.16:
     picocolors "^0.2.1"
     source-map "^0.6.1"
 
-postcss@^8.4.19, postcss@~8.4.19:
+postcss@^8.4.19:
   version "8.4.19"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.19.tgz#61178e2add236b17351897c8bcc0b4c8ecab56fc"
   integrity sha512-h+pbPsyhlYj6N2ozBmHhHrs9DzGmbaarbLvWipMRO7RLS+v4onj26MPFXA5OBYFxyqYhUJK456SwDcY9H2/zsA==
@@ -4935,6 +4935,15 @@ postcss@^8.4.19, postcss@~8.4.19:
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
+postcss@~8.4.21:
+  version "8.4.21"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.21.tgz#c639b719a57efc3187b13a1d765675485f4134f4"
+  integrity sha512-tP7u/Sn/dVxK2NnruI4H9BG+x+Wxz6oeZ1cJ8P6G/PZY0IKk4k/63TDsQf2kQq3+qoJeLm2kIBUNlZe3zgb4Zg==
+  dependencies:
+    nanoid "^3.3.4"
+    picocolors "^1.0.0"
+    source-map-js "^1.0.2"
+
 prebuild-install@^7.1.0, prebuild-install@^7.1.1:
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/prebuild-install/-/prebuild-install-7.1.1.tgz#de97d5b34a70a0c81334fd24641f2a1702352e45"