diff --git a/package.json b/package.json
index ab912ae..4fa85f9 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
         "jsdom": "^16.6.0",
         "markdown-it": "^12.0.6",
         "markdown-it-anchor": "^7.1.0",
-        "postcss": "^8.3.2",
+        "postcss": "^8.4.21",
         "postcss-cli": "^8.3.1",
         "rollup": "^2.51.2",
         "rollup-plugin-postcss": "^4.0.0",
diff --git a/yarn.lock b/yarn.lock
index 74a8a8a..8db9a07 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3347,10 +3347,10 @@ mustache@^2.3.2:
   resolved "https://registry.yarnpkg.com/mustache/-/mustache-2.3.2.tgz#a6d4d9c3f91d13359ab889a812954f9230a3d0c5"
   integrity sha512-KpMNwdQsYz3O/SBS1qJ/o3sqUJ5wSb8gb0pul8CO0S56b9Y2ALm8zCfsjPXsqGFfoNBkDwZuZIAjhsZI03gYVQ==
 
-nanoid@^3.1.23:
-  version "3.1.23"
-  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.23.tgz#f744086ce7c2bc47ee0a8472574d5c78e4183a81"
-  integrity sha512-FiB0kzdP0FFVGDKlRLEQ1BgDzU87dy5NnzjeW9YZNt+/c3+q82EQDUwniSAUxp/F0gFNI1ZhKU1FqYsMuqZVnw==
+nanoid@^3.3.4:
+  version "3.3.4"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.4.tgz#730b67e3cd09e2deacf03c027c81c9d9dbc5e8ab"
+  integrity sha512-MqBkQh/OHTS2egovRtLk45wEyNXwF+cokD+1YPf9u5VfJiRdAiRwB2froX5Co9Rh20xs4siNPm8naNotSD6RBw==
 
 napi-build-utils@^1.0.1:
   version "1.0.2"
@@ -3756,6 +3756,11 @@ path-type@^4.0.0:
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-4.0.0.tgz#84ed01c0a7ba380afe09d90a8c180dcd9d03043b"
   integrity sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==
 
+picocolors@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/picocolors/-/picocolors-1.0.0.tgz#cb5bdc74ff3f51892236eaf79d68bc44564ab81c"
+  integrity sha512-1fygroTLlHu66zi26VoTDv8yRgm0Fccecssto+MhsZ0D/DGW2sm8E8AjW7NU5VVTRt5GxbeZ5qBuJr+HyLYkjQ==
+
 picomatch@^2.0.4, picomatch@^2.2.1, picomatch@^2.2.2, picomatch@^2.2.3:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.0.tgz#f1f061de8f6a4bf022892e2d128234fb98302972"
@@ -4402,23 +4407,14 @@ postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.27:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
-postcss@^8.1.6, postcss@^8.2.1:
-  version "8.3.0"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.3.0.tgz#b1a713f6172ca427e3f05ef1303de8b65683325f"
-  integrity sha512-+ogXpdAjWGa+fdYY5BQ96V/6tAo+TdSSIMP5huJBIygdWwKtVoB5JWZ7yUd4xZ8r+8Kvvx4nyg/PQ071H4UtcQ==
+postcss@^8.1.6, postcss@^8.2.1, 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:
-    colorette "^1.2.2"
-    nanoid "^3.1.23"
-    source-map-js "^0.6.2"
-
-postcss@^8.3.2:
-  version "8.3.2"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.3.2.tgz#ed3ec489f5428af5740cd6effcc216b4d455ee64"
-  integrity sha512-y1FK/AWdZlBF5lusS5j5l4/vF67+vQZt1SXPVJ32y1kRGDQyrs1zk32hG1cInRTu14P0V+orPz+ifwW/7rR4bg==
-  dependencies:
-    colorette "^1.2.2"
-    nanoid "^3.1.23"
-    source-map-js "^0.6.2"
+    nanoid "^3.3.4"
+    picocolors "^1.0.0"
+    source-map-js "^1.0.2"
 
 posthtml-parser@^0.7.2:
   version "0.7.2"
@@ -5237,10 +5233,10 @@ socket.io@2.4.0:
     socket.io-client "2.4.0"
     socket.io-parser "~3.4.0"
 
-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@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-1.0.2.tgz#adbc361d9c62df380125e7f161f71c826f1e490c"
+  integrity sha512-R0XvVJ9WusLiqTCEiGCmICCMplcCkIwwR11mOSD9CR5u+IXYdiseeEuXCVAjS54zqwkLcPNnmU4OeJ6tUrWhDw==
 
 source-map-support@~0.5.19:
   version "0.5.19"