diff --git a/package-lock.json b/package-lock.json
index ad166b6..134ade1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
       "devDependencies": {
         "@webref/css": "^6.10.1",
         "aria-attributes": "^2.0.1",
-        "c8": "^8.0.1",
+        "c8": "^9.0.0",
         "html-element-attributes": "^3.3.0",
         "stylelint": "^16.1.0",
         "stylelint-test-rule-node": "^0.2.1",
@@ -431,19 +431,18 @@
       }
     },
     "node_modules/c8": {
-      "version": "8.0.1",
-      "resolved": "https://registry.npmjs.org/c8/-/c8-8.0.1.tgz",
-      "integrity": "sha512-EINpopxZNH1mETuI0DzRA4MZpAUH+IFiRhnmFD3vFr3vdrgxqi3VfE3KL0AIL+zDq8rC9bZqwM/VDmmoe04y7w==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/c8/-/c8-9.0.0.tgz",
+      "integrity": "sha512-nFJhU2Cz6Frh2awk3IW7wwk3wx27/U2v8ojQCHGc1GWTCHS6aMu4lal327/ZnnYj7oSThGF1X3qUP1yzAJBcOQ==",
       "dev": true,
       "dependencies": {
         "@bcoe/v8-coverage": "^0.2.3",
         "@istanbuljs/schema": "^0.1.3",
         "find-up": "^5.0.0",
-        "foreground-child": "^2.0.0",
+        "foreground-child": "^3.1.1",
         "istanbul-lib-coverage": "^3.2.0",
         "istanbul-lib-report": "^3.0.1",
         "istanbul-reports": "^3.1.6",
-        "rimraf": "^3.0.2",
         "test-exclude": "^6.0.0",
         "v8-to-istanbul": "^9.0.0",
         "yargs": "^17.7.2",
@@ -453,7 +452,7 @@
         "c8": "bin/c8.js"
       },
       "engines": {
-        "node": ">=12"
+        "node": ">=14.14.0"
       }
     },
     "node_modules/callsites": {
@@ -821,22 +820,6 @@
         "balanced-match": "^1.0.0"
       }
     },
-    "node_modules/flat-cache/node_modules/foreground-child": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.1.1.tgz",
-      "integrity": "sha512-TMKDUnIte6bfb5nWv7V/caI169OHgvwjb7V4WkeUvbQQdjr5rWKqHFiKWb/fcOwB+CzBT+qbWjvj+DVwRskpIg==",
-      "dev": true,
-      "dependencies": {
-        "cross-spawn": "^7.0.0",
-        "signal-exit": "^4.0.1"
-      },
-      "engines": {
-        "node": ">=14"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/flat-cache/node_modules/glob": {
       "version": "10.3.10",
       "resolved": "https://registry.npmjs.org/glob/-/glob-10.3.10.tgz",
@@ -892,18 +875,6 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
-    "node_modules/flat-cache/node_modules/signal-exit": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
-      "integrity": "sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==",
-      "dev": true,
-      "engines": {
-        "node": ">=14"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/flatted": {
       "version": "3.2.9",
       "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.2.9.tgz",
@@ -911,16 +882,19 @@
       "dev": true
     },
     "node_modules/foreground-child": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-2.0.0.tgz",
-      "integrity": "sha512-dCIq9FpEcyQyXKCkyzmlPTFNgrCzPudOe+mhvJU5zAtlBnGVy2yKxtfsxK2tQBThwq225jcvBjpw1Gr40uzZCA==",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.1.1.tgz",
+      "integrity": "sha512-TMKDUnIte6bfb5nWv7V/caI169OHgvwjb7V4WkeUvbQQdjr5rWKqHFiKWb/fcOwB+CzBT+qbWjvj+DVwRskpIg==",
       "dev": true,
       "dependencies": {
         "cross-spawn": "^7.0.0",
-        "signal-exit": "^3.0.2"
+        "signal-exit": "^4.0.1"
       },
       "engines": {
-        "node": ">=8.0.0"
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
       }
     },
     "node_modules/fs.realpath": {
@@ -1760,21 +1734,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/rimraf": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
-      "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
-      "dev": true,
-      "dependencies": {
-        "glob": "^7.1.3"
-      },
-      "bin": {
-        "rimraf": "bin.js"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -1835,10 +1794,16 @@
       }
     },
     "node_modules/signal-exit": {
-      "version": "3.0.7",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
-      "integrity": "sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==",
-      "dev": true
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
+      "integrity": "sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==",
+      "dev": true,
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
     },
     "node_modules/slash": {
       "version": "3.0.0",
@@ -2403,18 +2368,6 @@
         "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
       }
     },
-    "node_modules/write-file-atomic/node_modules/signal-exit": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
-      "integrity": "sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==",
-      "dev": true,
-      "engines": {
-        "node": ">=14"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
diff --git a/package.json b/package.json
index 6f1aa63..1df9c6f 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   "devDependencies": {
     "@webref/css": "^6.10.1",
     "aria-attributes": "^2.0.1",
-    "c8": "^8.0.1",
+    "c8": "^9.0.0",
     "html-element-attributes": "^3.3.0",
     "stylelint-test-rule-node": "^0.2.1",
     "stylelint": "^16.1.0",