diff --git a/package-lock.json b/package-lock.json
index 64343bf..0fde3e4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
         "netlify-plugin-hugo-cache-resources": "^0.2.1",
         "postcss": "^8.4.47",
         "postcss-cli": "^11.0.0",
-        "postcss-color-mod-function": "^3.0.3"
+        "postcss-color-mod-function": "^4.1.1"
       }
     },
     "node_modules/@csstools/convert-colors": {
@@ -1213,13 +1213,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/flatten": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/flatten/-/flatten-1.0.3.tgz",
-      "integrity": "sha512-dVsPA/UwQ8+2uoFe5GHtiBMu48dWLTdsuEd7CKGlZlD78r1TTWBvDuFaFGKCo/ZfEr95Uk56vZoX86OsHkUeIg==",
-      "deprecated": "flatten is deprecated in favor of utility frameworks such as lodash.",
-      "dev": true
-    },
     "node_modules/forwarded": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -1626,12 +1619,6 @@
         "node": ">=0.8.19"
       }
     },
-    "node_modules/indexes-of": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/indexes-of/-/indexes-of-1.0.1.tgz",
-      "integrity": "sha512-bup+4tap3Hympa+JBJUG7XuOsdNQ6fxt0MHyXMKuLBKn0OqsTfvUxkUrroEX1+B2VsSHvCjiIcZVxRtYa4nllA==",
-      "dev": true
-    },
     "node_modules/inflight": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
@@ -2386,40 +2373,19 @@
       }
     },
     "node_modules/postcss-color-mod-function": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/postcss-color-mod-function/-/postcss-color-mod-function-3.0.3.tgz",
-      "integrity": "sha512-YP4VG+xufxaVtzV6ZmhEtc+/aTXH3d0JLpnYfxqTvwZPbJhWqp8bSY3nfNzNRFLgB4XSaBA82OE4VjOOKpCdVQ==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/postcss-color-mod-function/-/postcss-color-mod-function-4.1.1.tgz",
+      "integrity": "sha512-pX35vgWh0c5gqYd/a5baiTr329GyEt56KBldQIEZwOi9V2eXC+9+e7yjnIKqjidHKxzstEfBJEbOXma8Ang33g==",
       "dev": true,
       "dependencies": {
         "@csstools/convert-colors": "^1.4.0",
-        "postcss": "^7.0.2",
-        "postcss-values-parser": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=6.0.0"
-      }
-    },
-    "node_modules/postcss-color-mod-function/node_modules/picocolors": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-0.2.1.tgz",
-      "integrity": "sha512-cMlDqaLEqfSaW8Z7N5Jw+lyIW869EzT73/F5lhtY9cLGoVxSXznfgfXMO0Z5K0o0Q2TkTXq+0KFsdnSe3jDViA==",
-      "dev": true
-    },
-    "node_modules/postcss-color-mod-function/node_modules/postcss": {
-      "version": "7.0.39",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.39.tgz",
-      "integrity": "sha512-yioayjNbHn6z1/Bywyb2Y4s3yvDAeXGOyxqD+LnVOinq6Mdmd++SW2wUNVzavyyHxd6+DxzWGIuosg6P1Rj8uA==",
-      "dev": true,
-      "dependencies": {
-        "picocolors": "^0.2.1",
-        "source-map": "^0.6.1"
+        "postcss-value-parser": "^4.2.0"
       },
       "engines": {
-        "node": ">=6.0.0"
+        "node": ">= 18"
       },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/postcss/"
+      "peerDependencies": {
+        "postcss": "^8.2.15"
       }
     },
     "node_modules/postcss-load-config": {
@@ -2483,20 +2449,6 @@
       "integrity": "sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==",
       "dev": true
     },
-    "node_modules/postcss-values-parser": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/postcss-values-parser/-/postcss-values-parser-2.0.1.tgz",
-      "integrity": "sha512-2tLuBsA6P4rYTNKCXYG/71C7j1pU6pK503suYOmn4xYrQIzW+opD+7FAFNuGSdZC/3Qfy334QbeMu7MEb8gOxg==",
-      "dev": true,
-      "dependencies": {
-        "flatten": "^1.0.2",
-        "indexes-of": "^1.0.1",
-        "uniq": "^1.0.1"
-      },
-      "engines": {
-        "node": ">=6.14.4"
-      }
-    },
     "node_modules/pretty-hrtime": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/pretty-hrtime/-/pretty-hrtime-1.0.3.tgz",
@@ -3266,12 +3218,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/uniq": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
-      "integrity": "sha512-Gw+zz50YNKPDKXs+9d+aKAjVwpjNwqzvNpLigIruT4HA9lMZNdMqs9x07kKHB/L9WRzqp4+DlTU5s4wG2esdoA==",
-      "dev": true
-    },
     "node_modules/unique-string": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-2.0.0.tgz",
diff --git a/package.json b/package.json
index bdefb53..78be7b0 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,6 @@
     "netlify-plugin-hugo-cache-resources": "^0.2.1",
     "postcss": "^8.4.47",
     "postcss-cli": "^11.0.0",
-    "postcss-color-mod-function": "^3.0.3"
+    "postcss-color-mod-function": "^4.1.1"
   }
 }