diff --git a/package-lock.json b/package-lock.json
index 2dd06b360..cc6929fa3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4574,9 +4574,9 @@
 			}
 		},
 		"node_modules/@webref/css": {
-			"version": "8.0.2",
-			"resolved": "https://registry.npmjs.org/@webref/css/-/css-8.0.2.tgz",
-			"integrity": "sha512-rYazvgX2Xe54ap29GHeA77Z/s8jCoStIjsZIpOAwJfaktudtxG7P+p54rbAGy63cMkknIeiFS5YYOJQ3M03aaw==",
+			"version": "8.1.0",
+			"resolved": "https://registry.npmjs.org/@webref/css/-/css-8.1.0.tgz",
+			"integrity": "sha512-6tXF7d9gjvKJom9uJ2Lrk8026Byl4mbo/QKdqqbbs0xDnNs35lKh0mEYkbXVEW1CSyQxOyTZjvNq6yUObbLeJw==",
 			"dev": true,
 			"license": "MIT",
 			"peerDependencies": {
@@ -9685,7 +9685,7 @@
 			],
 			"license": "MIT-0",
 			"devDependencies": {
-				"@webref/css": "8.0.2",
+				"@webref/css": "8.1.0",
 				"css-tree": "^3.1.0",
 				"postcss": "^8.4"
 			},
@@ -9991,7 +9991,7 @@
 				"@csstools/pack-test": "*",
 				"@csstools/postcss-bundler": "*",
 				"@csstools/postcss-tape": "*",
-				"@webref/css": "8.0.2"
+				"@webref/css": "8.1.0"
 			},
 			"engines": {
 				"node": ">=18"
diff --git a/packages/css-syntax-patches-for-csstree/package.json b/packages/css-syntax-patches-for-csstree/package.json
index bcf537137..d49cc2d47 100644
--- a/packages/css-syntax-patches-for-csstree/package.json
+++ b/packages/css-syntax-patches-for-csstree/package.json
@@ -36,7 +36,7 @@
 		"dist"
 	],
 	"devDependencies": {
-		"@webref/css": "8.0.2",
+		"@webref/css": "8.1.0",
 		"css-tree": "^3.1.0",
 		"postcss": "^8.4"
 	},
diff --git a/plugin-packs/postcss-preset-env/package.json b/plugin-packs/postcss-preset-env/package.json
index 332a69f0c..a76ca126d 100644
--- a/plugin-packs/postcss-preset-env/package.json
+++ b/plugin-packs/postcss-preset-env/package.json
@@ -129,7 +129,7 @@
 		"@csstools/pack-test": "*",
 		"@csstools/postcss-bundler": "*",
 		"@csstools/postcss-tape": "*",
-		"@webref/css": "8.0.2"
+		"@webref/css": "8.1.0"
 	},
 	"scripts": {
 		"prebuild": "node ./scripts/generate-plugins-data.mjs && eslint --fix ./src/plugins/*.mjs",