diff --git a/package-lock.json b/package-lock.json
index 765e392c..01c14a96 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -46,7 +46,7 @@
 				"postcss": "^8.4.31",
 				"prettier": "npm:wp-prettier@^3.0.3",
 				"webpack-cli": "^5.0.2",
-				"webpack-merge": "^5.8.0"
+				"webpack-merge": "^5.10.0"
 			},
 			"engines": {
 				"node": ">=18",
@@ -13789,6 +13789,14 @@
 				"node": ">=6"
 			}
 		},
+		"node_modules/flat": {
+			"version": "5.0.2",
+			"resolved": "https://registry.npmjs.org/flat/-/flat-5.0.2.tgz",
+			"integrity": "sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==",
+			"bin": {
+				"flat": "cli.js"
+			}
+		},
 		"node_modules/flat-cache": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-3.1.0.tgz",
@@ -29433,11 +29441,12 @@
 			}
 		},
 		"node_modules/webpack-merge": {
-			"version": "5.9.0",
-			"resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-5.9.0.tgz",
-			"integrity": "sha512-6NbRQw4+Sy50vYNTw7EyOn41OZItPiXB8GNv3INSoe3PSFaHJEz3SHTrYVaRm2LilNGnFUzh0FAwqPEmU/CwDg==",
+			"version": "5.10.0",
+			"resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-5.10.0.tgz",
+			"integrity": "sha512-+4zXKdx7UnO+1jaN4l2lHVD+mFvnlZQP/6ljaJVb4SZiwIKeUnrT5l0gkT8z+n4hKpC+jpOv6O9R+gLtag7pSA==",
 			"dependencies": {
 				"clone-deep": "^4.0.1",
+				"flat": "^5.0.2",
 				"wildcard": "^2.0.0"
 			},
 			"engines": {
diff --git a/package.json b/package.json
index 7dfc6155..aafd7409 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
 		"postcss": "^8.4.31",
 		"prettier": "npm:wp-prettier@^3.0.3",
 		"webpack-cli": "^5.0.2",
-		"webpack-merge": "^5.8.0"
+		"webpack-merge": "^5.10.0"
 	},
 	"scripts": {
 		"accessibility": "pa11y-ci --reporter=pa11y-ci-reporter-html --sitemap $npm_config_url/sitemap.xml",