diff --git a/.storybook/package.json b/.storybook/package.json
index b956cdb7fe8..9bc14e44165 100644
--- a/.storybook/package.json
+++ b/.storybook/package.json
@@ -68,7 +68,7 @@
 		"lit": "^3.3.0",
 		"lodash-es": "^4.17.21",
 		"npm-registry-fetch": "^18.0.2",
-		"postcss": "^8.5.3",
+		"postcss": "^8.5.4",
 		"prettier": "^3.5.3",
 		"react": "^18.3.1",
 		"react-dom": "^18.3.1",
diff --git a/package.json b/package.json
index 09bdef315b5..9484e21f6bf 100644
--- a/package.json
+++ b/package.json
@@ -98,7 +98,7 @@
 		"nx": "^21.1.2",
 		"open": "^10.1.2",
 		"pajv": "^1.2.0",
-		"postcss": "^8.5.3",
+		"postcss": "^8.5.4",
 		"postcss-extend": "^1.0.5",
 		"postcss-hover-media-feature": "^1.0.2",
 		"postcss-import": "^16.1.0",
diff --git a/plugins/postcss-rgb-mapping/package.json b/plugins/postcss-rgb-mapping/package.json
index 03c8a333042..77516f66732 100644
--- a/plugins/postcss-rgb-mapping/package.json
+++ b/plugins/postcss-rgb-mapping/package.json
@@ -31,7 +31,7 @@
 	"devDependencies": {
 		"ava": "^6.3.0",
 		"c8": "^10.1.3",
-		"postcss": "^8.5.3"
+		"postcss": "^8.5.4"
 	},
 	"keywords": [
 		"css",
diff --git a/plugins/stylelint-no-unknown-custom-properties/package.json b/plugins/stylelint-no-unknown-custom-properties/package.json
index 58c7ee998f5..0ea2cdb52cf 100644
--- a/plugins/stylelint-no-unknown-custom-properties/package.json
+++ b/plugins/stylelint-no-unknown-custom-properties/package.json
@@ -29,7 +29,7 @@
   "dependencies": {
     "colors": "^1.4.0",
     "fast-glob": "^3.3.3",
-    "postcss": "^8.5.3",
+    "postcss": "^8.5.4",
     "postcss-values-parser": "^6.0.2"
   },
   "peerDependencies": {
diff --git a/plugins/stylelint-no-unused-custom-properties/package.json b/plugins/stylelint-no-unused-custom-properties/package.json
index 771dd9a86fb..fe6a327bf6d 100644
--- a/plugins/stylelint-no-unused-custom-properties/package.json
+++ b/plugins/stylelint-no-unused-custom-properties/package.json
@@ -28,7 +28,7 @@
   },
   "dependencies": {
     "colors": "^1.4.0",
-    "postcss": "^8.5.3",
+    "postcss": "^8.5.4",
     "postcss-values-parser": "^6.0.2"
   },
   "peerDependencies": {
diff --git a/tokens/package.json b/tokens/package.json
index 9f3d270e67e..e7e3c7e4fec 100644
--- a/tokens/package.json
+++ b/tokens/package.json
@@ -30,7 +30,7 @@
 		"deepmerge": "^4.3.1",
 		"glob": "^11.0.2",
 		"lodash-es": "^4.17.21",
-		"postcss": "^8.5.3",
+		"postcss": "^8.5.4",
 		"postcss-sorting": "^9.1.0",
 		"style-dictionary": "^4.4.0"
 	},
diff --git a/tools/bundle/package.json b/tools/bundle/package.json
index 009d7594543..a9207a3585f 100644
--- a/tools/bundle/package.json
+++ b/tools/bundle/package.json
@@ -116,7 +116,7 @@
 		"@spectrum-css/underlay": "7.0.0-next.0",
 		"@spectrum-css/well": "8.0.0-next.0",
 		"colors": "^1.4.0",
-		"postcss": "^8.5.3",
+		"postcss": "^8.5.4",
 		"postcss-licensing": "^3.0.0"
 	},
 	"keywords": [
diff --git a/yarn.lock b/yarn.lock
index b0949ed4db7..21210964b3b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -152,7 +152,7 @@ __metadata:
     nx: "npm:^21.1.2"
     open: "npm:^10.1.2"
     pajv: "npm:^1.2.0"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     postcss-extend: "npm:^1.0.5"
     postcss-hover-media-feature: "npm:^1.0.2"
     postcss-import: "npm:^16.1.0"
@@ -4295,7 +4295,7 @@ __metadata:
     "@spectrum-css/underlay": "npm:7.0.0-next.0"
     "@spectrum-css/well": "npm:8.0.0-next.0"
     colors: "npm:^1.4.0"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     postcss-licensing: "npm:^3.0.0"
   languageName: unknown
   linkType: soft
@@ -5261,7 +5261,7 @@ __metadata:
     lit: "npm:^3.3.0"
     lodash-es: "npm:^4.17.21"
     npm-registry-fetch: "npm:^18.0.2"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     prettier: "npm:^3.5.3"
     react: "npm:^18.3.1"
     react-dom: "npm:^18.3.1"
@@ -5683,7 +5683,7 @@ __metadata:
     deepmerge: "npm:^4.3.1"
     glob: "npm:^11.0.2"
     lodash-es: "npm:^4.17.21"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     postcss-sorting: "npm:^9.1.0"
     style-dictionary: "npm:^4.4.0"
   languageName: unknown
@@ -5830,7 +5830,7 @@ __metadata:
   dependencies:
     ava: "npm:^6.3.0"
     c8: "npm:^10.1.3"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     postcss-values-parser: "npm:^6.0.2"
   peerDependencies:
     postcss: ">=8"
@@ -5858,7 +5858,7 @@ __metadata:
     c8: "npm:^10.1.3"
     colors: "npm:^1.4.0"
     fast-glob: "npm:^3.3.3"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     postcss-values-parser: "npm:^6.0.2"
     stylelint: "npm:^16.19.1"
   peerDependencies:
@@ -5873,7 +5873,7 @@ __metadata:
     ava: "npm:^6.3.0"
     c8: "npm:^10.1.3"
     colors: "npm:^1.4.0"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     postcss-values-parser: "npm:^6.0.2"
     stylelint: "npm:^16.19.1"
   peerDependencies:
@@ -15448,6 +15448,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"nanoid@npm:^3.3.11":
+  version: 3.3.11
+  resolution: "nanoid@npm:3.3.11"
+  bin:
+    nanoid: bin/nanoid.cjs
+  checksum: 10c0/40e7f70b3d15f725ca072dfc4f74e81fcf1fbb02e491cf58ac0c79093adc9b0a73b152bcde57df4b79cd097e13023d7504acb38404a4da7bc1cd8e887b82fe0b
+  languageName: node
+  linkType: hard
+
 "nanoid@npm:^3.3.8":
   version: 3.3.9
   resolution: "nanoid@npm:3.3.9"
@@ -17646,6 +17655,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"postcss@npm:^8.5.4":
+  version: 8.5.4
+  resolution: "postcss@npm:8.5.4"
+  dependencies:
+    nanoid: "npm:^3.3.11"
+    picocolors: "npm:^1.1.1"
+    source-map-js: "npm:^1.2.1"
+  checksum: 10c0/0feff648614a834f7cd5396ea6b05b658ca0507e10a4eaad03b56c348f6aec93f42a885fc1b30522630c6a7e49ae53b38a061e3cba526f2d9857afbe095a22bb
+  languageName: node
+  linkType: hard
+
 "prelude-ls@npm:^1.2.1":
   version: 1.2.1
   resolution: "prelude-ls@npm:1.2.1"