diff --git a/package-lock.json b/package-lock.json
index fd820476..31b122ee 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -45,7 +45,7 @@
         "jest": "^29.7.0",
         "prettier": "^3.3.2",
         "ts-jest": "^29.1.4",
-        "typescript": "~5.4.5",
+        "typescript": "~5.9.2",
         "typescript-eslint": "^7.13.0"
       },
       "engines": {
@@ -6167,9 +6167,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.4.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
+      "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.2.tgz",
+      "integrity": "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
diff --git a/package.json b/package.json
index 2d9d294a..a18e604e 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "jest": "^29.7.0",
     "prettier": "^3.3.2",
     "ts-jest": "^29.1.4",
-    "typescript": "~5.4.5",
+    "typescript": "~5.9.2",
     "typescript-eslint": "^7.13.0"
   },
   "homepage": "https://github.com/Azure/openapi-diff",