diff --git a/package-lock.json b/package-lock.json
index 239ae3f..07a7cbf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,7 +6,7 @@
   "packages": {
     "": {
       "name": "@ideal-postcodes/openapi",
-      "version": "4.12.0",
+      "version": "4.12.1",
       "license": "Copyright IDDQD Limited",
       "devDependencies": {
         "@cablanchard/semantic-release": "~1.3.4",
@@ -14,7 +14,7 @@
         "@redocly/cli": "~2.0.7",
         "@stoplight/prism-cli": "~5.0.0",
         "semantic-release": "~23.0.8",
-        "typescript": "~5.7.2"
+        "typescript": "~5.9.3"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -17335,10 +17335,11 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.7.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.2.tgz",
-      "integrity": "sha512-i5t66RHxDvVN40HfDd1PsEThGNnlMCMT3jMUuoh9/0TaqWevNontacunWyN02LA9/fIbEWlcHZcgTKb9QoaLfg==",
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "dev": true,
+      "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
diff --git a/package.json b/package.json
index 68b9044..b7b825d 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "@redocly/cli": "~2.0.7",
     "@stoplight/prism-cli": "~5.0.0",
     "semantic-release": "~23.0.8",
-    "typescript": "~5.7.2"
+    "typescript": "~5.9.3"
   },
   "scripts": {
     "prepublish": "tsc",