diff --git a/package-lock.json b/package-lock.json
index 0759bc1e9ef..aa62152c299 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19043,7 +19043,7 @@
 				"express": "^4.22.2",
 				"fresh": "^0.5.2",
 				"graceful-fs": "^4.2.11",
-				"mime-types": "^2.1.35",
+				"mime-types": "^3.0.2",
 				"parseurl": "^1.3.3",
 				"portscanner": "^2.2.0",
 				"router": "^2.2.0",
@@ -19067,6 +19067,22 @@
 				"node": "^22.20.0 || >=24.0.0",
 				"npm": ">= 8"
 			}
+		},
+		"packages/server/node_modules/mime-types": {
+			"version": "3.0.2",
+			"resolved": "https://registry.npmjs.org/mime-types/-/mime-types-3.0.2.tgz",
+			"integrity": "sha512-Lbgzdk0h4juoQ9fCKXW4by0UJqj+nOOrI9MJ1sSj4nI8aI2eo1qmvQEie4VD1glsS250n15LsWsYtCugiStS5A==",
+			"license": "MIT",
+			"dependencies": {
+				"mime-db": "^1.54.0"
+			},
+			"engines": {
+				"node": ">=18"
+			},
+			"funding": {
+				"type": "opencollective",
+				"url": "https://opencollective.com/express"
+			}
 		}
 	}
 }
diff --git a/packages/server/lib/middleware/serveIndex/serveIndex.cjs b/packages/server/lib/middleware/serveIndex/serveIndex.cjs
index ffc1f0e0745..eaedf522f82 100644
--- a/packages/server/lib/middleware/serveIndex/serveIndex.cjs
+++ b/packages/server/lib/middleware/serveIndex/serveIndex.cjs
@@ -1,10 +1,10 @@
 /*
  * serve-index
  *
- * Version: 1.9.1
+ * Version: 1.9.2
  *
  * Author: Douglas Christopher Wilson
- * Web: https://github.com/expressjs/serve-index/tree/20e83c893b701c3a117a0f6836be0f5a818bb925
+ * Web: https://github.com/expressjs/serve-index/tree/6f86a185446a37a99b2cd9694ce93df996aeba6f
  *
  * Licensed under
  *   MIT License, see "/LICENSES/MIT.txt"
@@ -150,7 +150,7 @@ function iconLookup(filename) {
 	// try by mime type
 	if (icons[mimetype]) {
 		return {
-			className: "icon-" + mimetype.replace("/", "-"),
+			className: "icon-" + mimetype.replace("/", "-").replace("+", "_"),
 			fileName: icons[mimetype]
 		};
 	}
@@ -305,6 +305,8 @@ const icons = {
 	"image/svg+xml": "page_white_vector.png",
 	"text/css": "page_white_code.png",
 	"text/html": "page_white_code.png",
+	// mime-types resolves ".js"/".mjs" to "text/javascript"; keep the JS-specific icon
+	"text/javascript": "page_white_code_red.png",
 	"text/less": "page_white_code.png",
 
 	// other, extension-specific icons
diff --git a/packages/server/package.json b/packages/server/package.json
index e69da3ce6a4..688caefcfc9 100644
--- a/packages/server/package.json
+++ b/packages/server/package.json
@@ -97,7 +97,7 @@
 		"express": "^4.22.2",
 		"fresh": "^0.5.2",
 		"graceful-fs": "^4.2.11",
-		"mime-types": "^2.1.35",
+		"mime-types": "^3.0.2",
 		"parseurl": "^1.3.3",
 		"portscanner": "^2.2.0",
 		"router": "^2.2.0",
diff --git a/packages/server/test/lib/server/main.js b/packages/server/test/lib/server/main.js
index 8e2e0849f0c..029efb9fa19 100644
--- a/packages/server/test/lib/server/main.js
+++ b/packages/server/test/lib/server/main.js
@@ -70,7 +70,7 @@ test("Get resource from application.a with replaced version placeholder (/versio
 		throw new Error(res.error);
 	}
 	t.is(res.statusCode, 200, "Correct HTTP status code");
-	t.regex(res.headers["content-type"], /application\/javascript/, "Correct content type");
+	t.regex(res.headers["content-type"], /text\/javascript/, "Correct content type");
 	// The 'minify' task rewrites the served file and appends a sourceMappingURL
 	t.is(res.text, "console.log(`1.0.0`);\n" + SOURCE_MAPPING_URL + "=versionTest.js.map", "Correct response");
 });
diff --git a/packages/server/test/lib/server/middleware/serveIndex.js b/packages/server/test/lib/server/middleware/serveIndex.js
index ea700f6b8f9..4bc693ce0ab 100644
--- a/packages/server/test/lib/server/middleware/serveIndex.js
+++ b/packages/server/test/lib/server/middleware/serveIndex.js
@@ -47,7 +47,7 @@ test.serial("serveIndex default", async (t) => {
 							"1.00 KB</span>"));
 				t.regex(content,
 					RegExp(
-						"<li><a href=\"/myFile2.js\" class=\"icon icon icon-js icon-application-javascript\" " +
+						"<li><a href=\"/myFile2.js\" class=\"icon icon icon-js icon-text-javascript\" " +
 							"title=\"myFile2.js\"><span class=\"name\">myFile2.js</span><span class=\"size\">" +
 							"1.00 MB</span>"));
 				t.regex(content,
@@ -115,7 +115,7 @@ test.serial("serveIndex no hidden", async (t) => {
 							"<span class=\"size\">1.00 KB</span>"));
 				t.regex(content,
 					RegExp(
-						"<li><a href=\"/myFile2.js\" class=\"icon icon icon-js icon-application-javascript\" " +
+						"<li><a href=\"/myFile2.js\" class=\"icon icon icon-js icon-text-javascript\" " +
 							"title=\"myFile2.js\"><span class=\"name\">myFile2.js</span>" +
 							"<span class=\"size\">1.00 MB</span>"));
 				t.regex(content,
@@ -210,7 +210,7 @@ test.serial("serveIndex no details", async (t) => {
 						"title=\"myFile1.meh\"><span class=\"name\">myFile1.meh</span>" +
 						"<span class=\"size\">1.00 KB</span>"));
 				t.regex(content, RegExp(
-					"<li><a href=\"/myFile2.js\" class=\"icon icon icon-js icon-application-javascript\" " +
+					"<li><a href=\"/myFile2.js\" class=\"icon icon icon-js icon-text-javascript\" " +
 						"title=\"myFile2.js\"><span class=\"name\">myFile2.js</span>" +
 						"<span class=\"size\">1.00 MB</span>"));
 				t.regex(content, RegExp(