diff --git a/package-lock.json b/package-lock.json
index c2f0f63a4..377030714 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -32,7 +32,7 @@
         "@whitespace/storybook-addon-html": "9.0.0",
         "@wordpress/block-library": "10.5.0",
         "browserify-transform-tools": "1.7.0",
-        "cssnano": "9.0.3",
+        "cssnano": "9.0.4",
         "eliminate": "1.1.2",
         "eslint": "10.10.0",
         "eslint-plugin-mdx": "3.8.1",
@@ -11515,13 +11515,13 @@
       }
     },
     "node_modules/cssnano": {
-      "version": "9.0.3",
-      "resolved": "https://registry.npmjs.org/cssnano/-/cssnano-9.0.3.tgz",
-      "integrity": "sha512-v4oRMYCXcJtI1MlGcwVgSP/TG/RrznC3iKQeNcFTQZZYWomp2j8CmgT9iiSO2v64K4LJSi6pWdyznmUUutLCKw==",
+      "version": "9.0.4",
+      "resolved": "https://registry.npmjs.org/cssnano/-/cssnano-9.0.4.tgz",
+      "integrity": "sha512-CdXjUnePN8UmFySZ65Oh83DUf/z/VV+yRc86PlMUA4JBJizXiwelynZvfLji+gY/Z94xH+RrCT48wZyqSJdhuw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "cssnano-preset-default": "^9.0.3"
+        "cssnano-preset-default": "^9.0.4"
       },
       "engines": {
         "node": "^22.22.3 || ^24.15.0 || >=26.0"
@@ -11535,15 +11535,15 @@
       }
     },
     "node_modules/cssnano-preset-default": {
-      "version": "9.0.3",
-      "resolved": "https://registry.npmjs.org/cssnano-preset-default/-/cssnano-preset-default-9.0.3.tgz",
-      "integrity": "sha512-UxvaUk/pNqHzjctjlaq4SSARlqPOdy7kA9Dho6fb1/xt/bYcar+57BFlSWpF5AvxjIfNK3Qkop5U9VDSUnuTvg==",
+      "version": "9.0.4",
+      "resolved": "https://registry.npmjs.org/cssnano-preset-default/-/cssnano-preset-default-9.0.4.tgz",
+      "integrity": "sha512-eHy3rfG0/TRGGG6gbgwLLlSs3Xr0xx2ShVwN94le+pydxAC3dXgmJTu8uIqdvBbrmEirUGuK9H5rUnxJRDXdoA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "browserslist": "^4.28.9",
         "cssnano-utils": "^7.0.2",
-        "postcss-calc": "^11.0.3",
+        "postcss-calc": "^11.1.1",
         "postcss-colormin": "^9.0.2",
         "postcss-convert-values": "^9.0.2",
         "postcss-discard-comments": "^9.0.2",
@@ -18062,9 +18062,9 @@
       }
     },
     "node_modules/postcss-calc": {
-      "version": "11.0.3",
-      "resolved": "https://registry.npmjs.org/postcss-calc/-/postcss-calc-11.0.3.tgz",
-      "integrity": "sha512-G0KjDwYacZXdyG0ijvvQleSh4AOTTNcjHny34t0Fh6v76dvTOMO1kyr7eKq3MPKD8Q7rxHzUXj4lpzT3cebatw==",
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/postcss-calc/-/postcss-calc-11.1.1.tgz",
+      "integrity": "sha512-EazB2CtQwKoBOCi8l334i/gnaObqcv418pLTvw4CmcqPLhPgP8IipVSixQO7lTRDrOBIwL72krecBfi5tpl4EA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -18074,7 +18074,7 @@
         "node": "^22.22.3 || ^24.15 || >=26.0"
       },
       "peerDependencies": {
-        "postcss": "^8.5.25"
+        "postcss": "^8.5.28"
       }
     },
     "node_modules/postcss-calc/node_modules/@csstools/css-tokenizer": {
@@ -31532,23 +31532,23 @@
       "dev": true
     },
     "cssnano": {
-      "version": "9.0.3",
-      "resolved": "https://registry.npmjs.org/cssnano/-/cssnano-9.0.3.tgz",
-      "integrity": "sha512-v4oRMYCXcJtI1MlGcwVgSP/TG/RrznC3iKQeNcFTQZZYWomp2j8CmgT9iiSO2v64K4LJSi6pWdyznmUUutLCKw==",
+      "version": "9.0.4",
+      "resolved": "https://registry.npmjs.org/cssnano/-/cssnano-9.0.4.tgz",
+      "integrity": "sha512-CdXjUnePN8UmFySZ65Oh83DUf/z/VV+yRc86PlMUA4JBJizXiwelynZvfLji+gY/Z94xH+RrCT48wZyqSJdhuw==",
       "dev": true,
       "requires": {
-        "cssnano-preset-default": "^9.0.3"
+        "cssnano-preset-default": "^9.0.4"
       }
     },
     "cssnano-preset-default": {
-      "version": "9.0.3",
-      "resolved": "https://registry.npmjs.org/cssnano-preset-default/-/cssnano-preset-default-9.0.3.tgz",
-      "integrity": "sha512-UxvaUk/pNqHzjctjlaq4SSARlqPOdy7kA9Dho6fb1/xt/bYcar+57BFlSWpF5AvxjIfNK3Qkop5U9VDSUnuTvg==",
+      "version": "9.0.4",
+      "resolved": "https://registry.npmjs.org/cssnano-preset-default/-/cssnano-preset-default-9.0.4.tgz",
+      "integrity": "sha512-eHy3rfG0/TRGGG6gbgwLLlSs3Xr0xx2ShVwN94le+pydxAC3dXgmJTu8uIqdvBbrmEirUGuK9H5rUnxJRDXdoA==",
       "dev": true,
       "requires": {
         "browserslist": "^4.28.9",
         "cssnano-utils": "^7.0.2",
-        "postcss-calc": "^11.0.3",
+        "postcss-calc": "^11.1.1",
         "postcss-colormin": "^9.0.2",
         "postcss-convert-values": "^9.0.2",
         "postcss-discard-comments": "^9.0.2",
@@ -35750,9 +35750,9 @@
       }
     },
     "postcss-calc": {
-      "version": "11.0.3",
-      "resolved": "https://registry.npmjs.org/postcss-calc/-/postcss-calc-11.0.3.tgz",
-      "integrity": "sha512-G0KjDwYacZXdyG0ijvvQleSh4AOTTNcjHny34t0Fh6v76dvTOMO1kyr7eKq3MPKD8Q7rxHzUXj4lpzT3cebatw==",
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/postcss-calc/-/postcss-calc-11.1.1.tgz",
+      "integrity": "sha512-EazB2CtQwKoBOCi8l334i/gnaObqcv418pLTvw4CmcqPLhPgP8IipVSixQO7lTRDrOBIwL72krecBfi5tpl4EA==",
       "dev": true,
       "requires": {
         "@csstools/css-tokenizer": "^4.0.0"
diff --git a/package.json b/package.json
index d32a36215..0ad96bf71 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,7 @@
     "@whitespace/storybook-addon-html": "9.0.0",
     "@wordpress/block-library": "10.5.0",
     "browserify-transform-tools": "1.7.0",
-    "cssnano": "9.0.3",
+    "cssnano": "9.0.4",
     "eliminate": "1.1.2",
     "eslint": "10.10.0",
     "eslint-plugin-mdx": "3.8.1",