diff --git a/package-lock.json b/package-lock.json
index a7824b9..e1e0b5d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
         "gaxios": "^6.0.0",
         "glob": "^10.3.10",
         "htmlparser2": "^9.0.0",
-        "marked": "^10.0.0",
+        "marked": "^12.0.1",
         "meow": "^13.0.0",
         "mime": "^4.0.0",
         "server-destroy": "^1.0.1",
@@ -6448,9 +6448,9 @@
       }
     },
     "node_modules/marked": {
-      "version": "10.0.0",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-10.0.0.tgz",
-      "integrity": "sha512-YiGcYcWj50YrwBgNzFoYhQ1hT6GmQbFG8SksnYJX1z4BXTHSOrz1GB5/Jm2yQvMg4nN1FHP4M6r03R10KrVUiA==",
+      "version": "12.0.2",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-12.0.2.tgz",
+      "integrity": "sha512-qXUm7e/YKFoqFPYPa3Ukg9xlI5cyAtGmyEIzMfW//m6kXwCy2Ps9DYf5ioijFKQ8qyuscrHoY04iJGctu2Kg0Q==",
       "bin": {
         "marked": "bin/marked.js"
       },
@@ -11333,19 +11333,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/semantic-release/node_modules/marked": {
-      "version": "12.0.2",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-12.0.2.tgz",
-      "integrity": "sha512-qXUm7e/YKFoqFPYPa3Ukg9xlI5cyAtGmyEIzMfW//m6kXwCy2Ps9DYf5ioijFKQ8qyuscrHoY04iJGctu2Kg0Q==",
-      "dev": true,
-      "license": "MIT",
-      "bin": {
-        "marked": "bin/marked.js"
-      },
-      "engines": {
-        "node": ">= 18"
-      }
-    },
     "node_modules/semver": {
       "version": "7.6.0",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.0.tgz",
diff --git a/package.json b/package.json
index e5664de..828e0bb 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "gaxios": "^6.0.0",
     "glob": "^10.3.10",
     "htmlparser2": "^9.0.0",
-    "marked": "^10.0.0",
+    "marked": "^12.0.1",
     "meow": "^13.0.0",
     "mime": "^4.0.0",
     "server-destroy": "^1.0.1",
diff --git a/src/server.ts b/src/server.ts
index ae1e432..4ba2362 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -97,7 +97,16 @@ async function handleRequest(
 		let mimeType = mime.getType(localPath);
 		const isMarkdown = request.url?.toLocaleLowerCase().endsWith('.md');
 		if (isMarkdown && options.markdown) {
-			data = marked(data, {gfm: true});
+			const markedData = marked(data, {gfm: true});
+			if (typeof markedData === 'string') {
+				data = markedData;
+			} else if (
+				(typeof markedData === 'object' || typeof markedData === 'function') &&
+				typeof markedData.then === 'function'
+			) {
+				data = await markedData;
+			}
+
 			mimeType = 'text/html; charset=UTF-8';
 		}