diff --git a/extensions/ql-vscode/package-lock.json b/extensions/ql-vscode/package-lock.json
index f4f1f3b03bb..1dc34eba59f 100644
--- a/extensions/ql-vscode/package-lock.json
+++ b/extensions/ql-vscode/package-lock.json
@@ -137,7 +137,7 @@
         "ts-json-schema-generator": "^2.3.0",
         "ts-node": "^10.9.2",
         "ts-unused-exports": "^11.0.1",
-        "typescript": "^5.6.2",
+        "typescript": "^5.9.3",
         "typescript-plugin-css-modules": "^5.2.0",
         "vite": "^7.1.5",
         "vite-node": "^3.2.4"
@@ -26675,9 +26675,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.9.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.2.tgz",
-      "integrity": "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A==",
+      "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": {
diff --git a/extensions/ql-vscode/package.json b/extensions/ql-vscode/package.json
index 9c229543d37..ea6f6b03cbc 100644
--- a/extensions/ql-vscode/package.json
+++ b/extensions/ql-vscode/package.json
@@ -2188,7 +2188,7 @@
     "ts-json-schema-generator": "^2.3.0",
     "ts-node": "^10.9.2",
     "ts-unused-exports": "^11.0.1",
-    "typescript": "^5.6.2",
+    "typescript": "^5.9.3",
     "typescript-plugin-css-modules": "^5.2.0",
     "vite": "^7.1.5",
     "vite-node": "^3.2.4"