diff --git a/.changeset/renovate-6a81dd3.md b/.changeset/renovate-6a81dd3.md
new file mode 100644
index 0000000000..9cf6fee161
--- /dev/null
+++ b/.changeset/renovate-6a81dd3.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-adr-backend': patch
+---
+
+Updated dependency `marked` to `^12.0.0`.
diff --git a/plugins/adr-backend/package.json b/plugins/adr-backend/package.json
index 73def32c34..0216a8d4a1 100644
--- a/plugins/adr-backend/package.json
+++ b/plugins/adr-backend/package.json
@@ -41,14 +41,13 @@
     "express": "^4.17.1",
     "express-promise-router": "^4.1.0",
     "luxon": "^3.0.0",
-    "marked": "^4.0.14",
+    "marked": "^12.0.0",
     "node-fetch": "^2.6.5",
     "winston": "^3.2.1",
     "yn": "^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",
-    "@types/marked": "^5.0.0",
     "@types/supertest": "^2.0.8",
     "supertest": "^6.1.3"
   },
diff --git a/plugins/adr-backend/src/search/madrParser.ts b/plugins/adr-backend/src/search/madrParser.ts
index 0dd1437538..bb466d13c3 100644
--- a/plugins/adr-backend/src/search/madrParser.ts
+++ b/plugins/adr-backend/src/search/madrParser.ts
@@ -15,29 +15,27 @@
  */
 
 import { DateTime } from 'luxon';
-import { marked } from 'marked';
+import { marked, Tokens, TokensList } from 'marked';
 import {
   MADR_DATE_FORMAT,
   parseMadrWithFrontmatter,
 } from '@backstage/plugin-adr-common';
 
-const getTitle = (tokens: marked.TokensList): string | undefined => {
+const getTitle = (tokens: TokensList): string | undefined => {
   return (
-    tokens.find(
-      t => t.type === 'heading' && t.depth === 1,
-    ) as marked.Tokens.Heading
+    tokens.find(t => t.type === 'heading' && t.depth === 1) as Tokens.Heading
   )?.text;
 };
 
-const getStatusForV2Format = (tokens: marked.TokensList): string | undefined =>
-  (tokens.find(t => t.type === 'list') as marked.Tokens.List)?.items
+const getStatusForV2Format = (tokens: TokensList): string | undefined =>
+  (tokens.find(t => t.type === 'list') as Tokens.List)?.items
     ?.find(t => /^status:/i.test(t.text))
     ?.text.replace(/^status:/i, '')
     .trim()
     .toLocaleLowerCase('en-US');
 
-const getDateForV2Format = (tokens: marked.TokensList): string | undefined => {
-  const listTokens = (tokens.find(t => t.type === 'list') as marked.Tokens.List)
+const getDateForV2Format = (tokens: TokensList): string | undefined => {
+  const listTokens = (tokens.find(t => t.type === 'list') as Tokens.List)
     ?.items;
   const adrDateTime = listTokens
     ?.find(t => /^date:/i.test(t.text))
@@ -47,13 +45,13 @@ const getDateForV2Format = (tokens: marked.TokensList): string | undefined => {
 };
 
 const getStatus = (
-  tokens: marked.TokensList,
+  tokens: TokensList,
   frontMatterStatus?: string,
 ): string | undefined => {
   return frontMatterStatus ?? getStatusForV2Format(tokens);
 };
 const getDate = (
-  tokens: marked.TokensList,
+  tokens: TokensList,
   dateFormat: string,
   frontMatterDate?: string,
 ): string | undefined => {
diff --git a/yarn.lock b/yarn.lock
index f71d95fbcd..ffabb02910 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4225,12 +4225,11 @@ __metadata:
     "@backstage/plugin-adr-common": "workspace:^"
     "@backstage/plugin-search-common": "workspace:^"
     "@types/express": ^4.17.6
-    "@types/marked": ^5.0.0
     "@types/supertest": ^2.0.8
     express: ^4.17.1
     express-promise-router: ^4.1.0
     luxon: ^3.0.0
-    marked: ^4.0.14
+    marked: ^12.0.0
     node-fetch: ^2.6.5
     supertest: ^6.1.3
     winston: ^3.2.1
@@ -18885,13 +18884,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/marked@npm:^5.0.0":
-  version: 5.0.2
-  resolution: "@types/marked@npm:5.0.2"
-  checksum: 2875618970bd5aaba472e313c799bbe241fe9e31d1e79782841a0cc04e08ab2a98653166f1fb99bf8bcf140d3878c3ab960a12aa8f0fb949d8277e8a01d3411b
-  languageName: node
-  linkType: hard
-
 "@types/mdast@npm:^3.0.0, @types/mdast@npm:^3.0.3":
   version: 3.0.10
   resolution: "@types/mdast@npm:3.0.10"
@@ -34189,6 +34181,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"marked@npm:^12.0.0":
+  version: 12.0.0
+  resolution: "marked@npm:12.0.0"
+  bin:
+    marked: bin/marked.js
+  checksum: 973e803debf7eca946213cd583792c2968ecab1b6698653604272d5406f9f07375a4865a7a28633a7200c8a4682761f8d866198fb36c10c686e3bda3a9b36fc9
+  languageName: node
+  linkType: hard
+
 "marked@npm:^4.0.14":
   version: 4.3.0
   resolution: "marked@npm:4.3.0"