diff --git a/model/package.json b/model/package.json
index 64522c019..3e6263b6c 100644
--- a/model/package.json
+++ b/model/package.json
@@ -35,7 +35,7 @@
   },
   "dependencies": {
     "@joi/date": "^2.1.1",
-    "marked": "^15.0.12",
+    "marked": "^18.0.0",
     "nanoid": "^5.0.7",
     "slug": "^11.0.0",
     "uuid": "^11.1.0"
diff --git a/package-lock.json b/package-lock.json
index 7949931ce..45bc2bdce 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -169,69 +169,6 @@
         "npm": "^10.9.0"
       }
     },
-    "designer/node_modules/@defra/forms-engine-plugin": {
-      "version": "4.5.5",
-      "resolved": "https://registry.npmjs.org/@defra/forms-engine-plugin/-/forms-engine-plugin-4.5.5.tgz",
-      "integrity": "sha512-+FpU2C654NUz1uVgGKB9iLSeOLt3bXsMKM678csQysO2EUB7j655qYh1J5q/bwdhiA4TeEZpxJ3dJ+rDKdk7vg==",
-      "hasInstallScript": true,
-      "license": "SEE LICENSE IN LICENSE",
-      "dependencies": {
-        "@defra/forms-model": "^3.0.637",
-        "@defra/hapi-tracing": "^1.29.0",
-        "@defra/interactive-map": "^0.0.17-alpha",
-        "@elastic/ecs-pino-format": "^1.5.0",
-        "@hapi/boom": "^10.0.1",
-        "@hapi/bourne": "^3.0.0",
-        "@hapi/catbox": "^12.1.1",
-        "@hapi/catbox-memory": "^6.0.2",
-        "@hapi/catbox-redis": "^7.0.2",
-        "@hapi/crumb": "^9.0.1",
-        "@hapi/hapi": "^21.4.4",
-        "@hapi/hoek": "^11.0.7",
-        "@hapi/inert": "^7.1.0",
-        "@hapi/jwt": "^3.2.1",
-        "@hapi/vision": "^7.0.3",
-        "@hapi/wreck": "^18.1.0",
-        "@hapi/yar": "^11.0.3",
-        "@turf/bbox": "^7.3.4",
-        "@turf/centroid": "^7.3.4",
-        "@types/humanize-duration": "^3.27.4",
-        "accessible-autocomplete": "^3.0.1",
-        "atob": "^2.1.2",
-        "blankie": "^5.0.0",
-        "blipp": "^4.0.2",
-        "btoa": "^1.2.1",
-        "chokidar": "3.6.0",
-        "convict": "^6.2.5",
-        "date-fns": "^4.1.0",
-        "dotenv": "^17.2.3",
-        "expr-eval-fork": "^3.0.0",
-        "geodesy": "^2.4.0",
-        "govuk-frontend": "^5.13.0",
-        "hapi-pino": "^13.0.0",
-        "hapi-pulse": "^3.0.1",
-        "highlight.js": "^11.11.1",
-        "http-status-codes": "^2.3.0",
-        "humanize-duration": "^3.33.1",
-        "ioredis": "^5.8.2",
-        "joi": "^17.13.3",
-        "liquidjs": "^10.24.0",
-        "lodash": "^4.17.21",
-        "marked": "^15.0.12",
-        "nunjucks": "^3.2.4",
-        "obscenity": "^0.4.5",
-        "outdent": "^0.8.0",
-        "pino": "^9.14.0",
-        "pino-pretty": "^13.1.2",
-        "proxy-agent": "^6.5.0",
-        "resolve": "^1.22.11",
-        "yaml": "^2.8.1"
-      },
-      "engines": {
-        "node": ">=22.11.0 <25.0.0",
-        "npm": ">=10.9.0 <11.6.4"
-      }
-    },
     "designer/node_modules/@testing-library/react": {
       "version": "16.0.1",
       "resolved": "https://registry.npmjs.org/@testing-library/react/-/react-16.0.1.tgz",
@@ -260,48 +197,6 @@
         }
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     },
-    "designer/node_modules/@turf/bbox": {
-      "version": "7.3.4",
-      "resolved": "https://registry.npmjs.org/@turf/bbox/-/bbox-7.3.4.tgz",
-      "integrity": "sha512-D5ErVWtfQbEPh11yzI69uxqrcJmbPU/9Y59f1uTapgwAwQHQztDWgsYpnL3ns8r1GmPWLP8sGJLVTIk2TZSiYA==",
-      "license": "MIT",
-      "dependencies": {
-        "@turf/helpers": "7.3.4",
-        "@turf/meta": "7.3.4",
-        "@types/geojson": "^7946.0.10",
-        "tslib": "^2.8.1"
-      },
-      "funding": {
-        "url": "https://opencollective.com/turf"
-      }
-    },
-    "designer/node_modules/@turf/helpers": {
-      "version": "7.3.4",
-      "resolved": "https://registry.npmjs.org/@turf/helpers/-/helpers-7.3.4.tgz",
-      "integrity": "sha512-U/S5qyqgx3WTvg4twaH0WxF3EixoTCfDsmk98g1E3/5e2YKp7JKYZdz0vivsS5/UZLJeZDEElOSFH4pUgp+l7g==",
-      "license": "MIT",
-      "dependencies": {
-        "@types/geojson": "^7946.0.10",
-        "tslib": "^2.8.1"
-      },
-      "funding": {
-        "url": "https://opencollective.com/turf"
-      }
-    },
-    "designer/node_modules/@turf/meta": {
-      "version": "7.3.4",
-      "resolved": "https://registry.npmjs.org/@turf/meta/-/meta-7.3.4.tgz",
-      "integrity": "sha512-tlmw9/Hs1p2n0uoHVm1w3ugw1I6L8jv9YZrcdQa4SH5FX5UY0ATrKeIvfA55FlL//PGuYppJp+eyg/0eb4goqw==",
-      "license": "MIT",
-      "dependencies": {
-        "@turf/helpers": "7.3.4",
-        "@types/geojson": "^7946.0.10",
-        "tslib": "^2.8.1"
-      },
-      "funding": {
-        "url": "https://opencollective.com/turf"
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     "designer/node_modules/@x-govuk/govuk-prototype-components": {
       "version": "5.0.2",
       "resolved": "https://registry.npmjs.org/@x-govuk/govuk-prototype-components/-/govuk-prototype-components-5.0.2.tgz",
@@ -367,7 +262,7 @@
       "license": "OGL-UK-3.0",
       "dependencies": {
         "@joi/date": "^2.1.1",
-        "marked": "^15.0.12",
+        "marked": "^18.0.0",
         "nanoid": "^5.0.7",
         "slug": "^11.0.0",
         "uuid": "^11.1.0"
@@ -386,6 +281,18 @@
         "joi": "^17.0.0"
       }
     },
+    "model/node_modules/marked": {
+      "version": "18.0.0",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-18.0.0.tgz",
+      "integrity": "sha512-2e7Qiv/HJSXj8rDEpgTvGKsP8yYtI9xXHKDnrftrmnrJPaFNM7VRb2YCzWaX4BP1iCJ/XPduzDJZMFoqTCcIMA==",
+      "license": "MIT",
+      "bin": {
+        "marked": "bin/marked.js"
+      },
+      "engines": {
+        "node": ">= 20"
+      }
+    },
     "node_modules/@aashutoshrathi/word-wrap": {
       "version": "1.2.6",
       "resolved": "https://registry.npmjs.org/@aashutoshrathi/word-wrap/-/word-wrap-1.2.6.tgz",
@@ -4221,6 +4128,120 @@
       "resolved": "designer",
       "link": true
     },
+    "node_modules/@defra/forms-engine-plugin": {
+      "version": "4.5.6",
+      "resolved": "https://registry.npmjs.org/@defra/forms-engine-plugin/-/forms-engine-plugin-4.5.6.tgz",
+      "integrity": "sha512-xuG3LnszavdenRylVNVm3JJ6U1cEdQG+ZZmWh1VjMinqDsR1RVj6gxMwlEJpUv0SyhyuLZw0Nq1oR/0+ApMBPQ==",
+      "hasInstallScript": true,
+      "license": "SEE LICENSE IN LICENSE",
+      "dependencies": {
+        "@defra/forms-model": "^3.0.637",
+        "@defra/hapi-tracing": "^1.29.0",
+        "@defra/interactive-map": "^0.0.17-alpha",
+        "@elastic/ecs-pino-format": "^1.5.0",
+        "@hapi/boom": "^10.0.1",
+        "@hapi/bourne": "^3.0.0",
+        "@hapi/catbox": "^12.1.1",
+        "@hapi/catbox-memory": "^6.0.2",
+        "@hapi/catbox-redis": "^7.0.2",
+        "@hapi/crumb": "^9.0.1",
+        "@hapi/hapi": "^21.4.4",
+        "@hapi/hoek": "^11.0.7",
+        "@hapi/inert": "^7.1.0",
+        "@hapi/jwt": "^3.2.1",
+        "@hapi/vision": "^7.0.3",
+        "@hapi/wreck": "^18.1.0",
+        "@hapi/yar": "^11.0.3",
+        "@turf/bbox": "^7.3.4",
+        "@turf/centroid": "^7.3.4",
+        "@types/humanize-duration": "^3.27.4",
+        "accessible-autocomplete": "^3.0.1",
+        "atob": "^2.1.2",
+        "blankie": "^5.0.0",
+        "blipp": "^4.0.2",
+        "btoa": "^1.2.1",
+        "chokidar": "3.6.0",
+        "convict": "^6.2.5",
+        "date-fns": "^4.1.0",
+        "dotenv": "^17.2.3",
+        "expr-eval-fork": "^3.0.0",
+        "geodesy": "^2.4.0",
+        "govuk-frontend": "^5.13.0",
+        "hapi-pino": "^13.0.0",
+        "hapi-pulse": "^3.0.1",
+        "highlight.js": "^11.11.1",
+        "http-status-codes": "^2.3.0",
+        "humanize-duration": "^3.33.1",
+        "ioredis": "^5.8.2",
+        "joi": "^17.13.3",
+        "liquidjs": "^10.24.0",
+        "lodash": "^4.17.21",
+        "marked": "^15.0.12",
+        "nunjucks": "^3.2.4",
+        "obscenity": "^0.4.5",
+        "outdent": "^0.8.0",
+        "pino": "^9.14.0",
+        "pino-pretty": "^13.1.2",
+        "proxy-agent": "^6.5.0",
+        "resolve": "^1.22.11",
+        "yaml": "^2.8.1"
+      },
+      "engines": {
+        "node": ">=22.11.0 <25.0.0",
+        "npm": ">=10.9.0 <11.6.4"
+      }
+    },
+    "node_modules/@defra/forms-engine-plugin/node_modules/@turf/bbox": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@turf/bbox/-/bbox-7.3.4.tgz",
+      "integrity": "sha512-D5ErVWtfQbEPh11yzI69uxqrcJmbPU/9Y59f1uTapgwAwQHQztDWgsYpnL3ns8r1GmPWLP8sGJLVTIk2TZSiYA==",
+      "license": "MIT",
+      "dependencies": {
+        "@turf/helpers": "7.3.4",
+        "@turf/meta": "7.3.4",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@defra/forms-engine-plugin/node_modules/@turf/helpers": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@turf/helpers/-/helpers-7.3.4.tgz",
+      "integrity": "sha512-U/S5qyqgx3WTvg4twaH0WxF3EixoTCfDsmk98g1E3/5e2YKp7JKYZdz0vivsS5/UZLJeZDEElOSFH4pUgp+l7g==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@defra/forms-engine-plugin/node_modules/@turf/meta": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@turf/meta/-/meta-7.3.4.tgz",
+      "integrity": "sha512-tlmw9/Hs1p2n0uoHVm1w3ugw1I6L8jv9YZrcdQa4SH5FX5UY0ATrKeIvfA55FlL//PGuYppJp+eyg/0eb4goqw==",
+      "license": "MIT",
+      "dependencies": {
+        "@turf/helpers": "7.3.4",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@defra/forms-engine-plugin/node_modules/govuk-frontend": {
+      "version": "5.14.0",
+      "resolved": "https://registry.npmjs.org/govuk-frontend/-/govuk-frontend-5.14.0.tgz",
+      "integrity": "sha512-MgfaXswIM6KpXS2T5gltEnzgVLgfM3UoE9+rYkhBiR0suaJ8Let31VZXQZqz9QhiPDbv28fW1nRjIyLujfZIBA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 4.2.0"
+      }
+    },
     "node_modules/@defra/forms-model": {
       "resolved": "model",
       "link": true
@@ -29903,15 +29924,6 @@
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       "license": "ISC"
     },
-    "node_modules/preact": {
-      "version": "8.5.3",
-      "resolved": "https://registry.npmjs.org/preact/-/preact-8.5.3.tgz",
-      "integrity": "sha512-O3kKP+1YdgqHOFsZF2a9JVdtqD+RPzCQc3rP+Ualf7V6rmRDchZ9MJbiGTT7LuyqFKZqlHSOyO/oMFmI2lVTsw==",
-      "hasInstallScript": true,
-      "license": "MIT",
-      "optional": true,
-      "peer": true
-    },
     "node_modules/prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@@ -36075,6 +36087,15 @@
         "type": "github",
         "url": "https://github.com/sponsors/wooorm"
       }
+    },
+    "node_modules/preact": {
+      "version": "8.5.3",
+      "resolved": "https://registry.npmjs.org/preact/-/preact-8.5.3.tgz",
+      "integrity": "sha512-O3kKP+1YdgqHOFsZF2a9JVdtqD+RPzCQc3rP+Ualf7V6rmRDchZ9MJbiGTT7LuyqFKZqlHSOyO/oMFmI2lVTsw==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true
     }
   }
 }