diff --git a/package.json b/package.json
index e12f9e5..3b2ddec 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "lint-staged": "^11.2.6",
     "markdown-it": "^12.3.0",
     "npm-run-all": "^4.1.5",
-    "postcss": "^8.3.11",
+    "postcss": "^8.4.5",
     "postcss-cli": "^8.3.1",
     "postcss-header": "^3.0.1",
     "postcss-import": "^14.0.2",
diff --git a/yarn.lock b/yarn.lock
index d6d0327..3603aab 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2294,14 +2294,14 @@ postcss@^7.0.14, postcss@^7.0.17, postcss@^7.0.2, postcss@^7.0.32, postcss@^7.0.
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
-postcss@^8.3.11:
-  version "8.3.11"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.3.11.tgz#c3beca7ea811cd5e1c4a3ec6d2e7599ef1f8f858"
-  integrity sha512-hCmlUAIlUiav8Xdqw3Io4LcpA1DOt7h3LSTAC4G6JGHFFaWzI6qvFt9oilvl8BmkbBRX1IhM90ZAmpk68zccQA==
+postcss@^8.4.5:
+  version "8.4.5"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.5.tgz#bae665764dfd4c6fcc24dc0fdf7e7aa00cc77f95"
+  integrity sha512-jBDboWM8qpaqwkMwItqTQTiFikhs/67OYVvblFFTM7MrZjt6yMKd6r2kgXizEbTTljacm4NldIlZnhbjr84QYg==
   dependencies:
     nanoid "^3.1.30"
     picocolors "^1.0.0"
-    source-map-js "^0.6.2"
+    source-map-js "^1.0.1"
 
 prelude-ls@^1.2.1:
   version "1.2.1"
@@ -2487,10 +2487,10 @@ slice-ansi@^4.0.0:
     astral-regex "^2.0.0"
     is-fullwidth-code-point "^3.0.0"
 
-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-js@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-1.0.1.tgz#a1741c131e3c77d048252adfa24e23b908670caf"
+  integrity sha512-4+TN2b3tqOCd/kaGRJ/sTYA0tR0mdXx26ipdolxcwtJVqEnqNYvlCAt1q3ypy4QMlYus+Zh34RNtYLoq2oQ4IA==
 
 source-map@^0.5.6:
   version "0.5.7"