diff --git a/sites/dev/package.json b/sites/dev/package.json
index c91598f3062..3705c9407e9 100644
--- a/sites/dev/package.json
+++ b/sites/dev/package.json
@@ -61,7 +61,7 @@
   "devDependencies": {
     "autoprefixer": "10.4.17",
     "js-yaml": "4.1.0",
-    "postcss": "8.4.33",
+    "postcss": "8.4.34",
     "remark-extract-frontmatter": "3.2.0",
     "remark-mdx-frontmatter": "4.0.0",
     "tailwindcss": "3.4.1",
diff --git a/sites/lab/package.json b/sites/lab/package.json
index a6bb5545ab1..26534b851ee 100644
--- a/sites/lab/package.json
+++ b/sites/lab/package.json
@@ -62,7 +62,7 @@
   "devDependencies": {
     "autoprefixer": "10.4.17",
     "js-yaml": "4.1.0",
-    "postcss": "8.4.33",
+    "postcss": "8.4.34",
     "remark-extract-frontmatter": "3.2.0",
     "remark-mdx-frontmatter": "4.0.0",
     "tailwindcss": "3.4.1",
diff --git a/sites/org/package.json b/sites/org/package.json
index 2f1f818d400..c4ac18d7e59 100644
--- a/sites/org/package.json
+++ b/sites/org/package.json
@@ -69,7 +69,7 @@
   "devDependencies": {
     "autoprefixer": "10.4.17",
     "js-yaml": "4.1.0",
-    "postcss": "8.4.33",
+    "postcss": "8.4.34",
     "remark-extract-frontmatter": "3.2.0",
     "remark-mdx-frontmatter": "4.0.0",
     "tailwindcss": "3.4.1",
diff --git a/yarn.lock b/yarn.lock
index ec5a41a3a49..0cf5b7cb96d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11334,10 +11334,10 @@ postcss@8.4.31:
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
-postcss@8.4.33, postcss@^8.4.23:
-  version "8.4.33"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.33.tgz#1378e859c9f69bf6f638b990a0212f43e2aaa742"
-  integrity sha512-Kkpbhhdjw2qQs2O2DGX+8m5OVqEcbB9HRBvuYM9pgrjEFUg30A9LmXNlTAUj4S9kgtGyrMbTzVjH7E+s5Re2yg==
+postcss@8.4.34, postcss@^8.4.23:
+  version "8.4.34"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.34.tgz#563276e86b4ff20dfa5eed0d394d4c53853b2051"
+  integrity sha512-4eLTO36woPSocqZ1zIrFD2K1v6wH7pY1uBh0JIM2KKfrVtGvPFiAku6aNOP0W1Wr9qwnaCsF0Z+CrVnryB2A8Q==
   dependencies:
     nanoid "^3.3.7"
     picocolors "^1.0.0"