diff --git a/package-lock.json b/package-lock.json
index 6a286a0..b8ad301 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -68,7 +68,7 @@
         "jest-environment-jsdom": "^29.7.0",
         "ts-jest": "^29.0.3",
         "ts-node": "^10.9.1",
-        "typescript": "^4.8.4"
+        "typescript": "^5.4.5"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -13301,16 +13301,16 @@
       }
     },
     "node_modules/typescript": {
-      "version": "4.9.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
-      "integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
+      "version": "5.4.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
+      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
       },
       "engines": {
-        "node": ">=4.2.0"
+        "node": ">=14.17"
       }
     },
     "node_modules/unbox-primitive": {
diff --git a/package.json b/package.json
index dc8d3b5..e3c18fb 100644
--- a/package.json
+++ b/package.json
@@ -84,7 +84,7 @@
     "jest-environment-jsdom": "^29.7.0",
     "ts-jest": "^29.0.3",
     "ts-node": "^10.9.1",
-    "typescript": "^4.8.4"
+    "typescript": "^5.4.5"
   },
   "browserslist": {
     "production": [
diff --git a/src/session/PurposeCache.ts b/src/session/PurposeCache.ts
index f59ae8c..9ef843d 100644
--- a/src/session/PurposeCache.ts
+++ b/src/session/PurposeCache.ts
@@ -45,6 +45,9 @@ export async function addToCache(url: string, cache: PurposeCache) {
       ) {
         // eslint-disable-next-line no-param-reassign
         (cache[subject.value] ??= {})[
+          // if the predicate.value is not a key of the map object this won't be executed,
+          // as it is already checked in the if expression
+          // @ts-ignore
           map[predicate.value] as "purposeLabel" | "definition"
         ] ??= object.value;
       }