diff --git a/package.json b/package.json
index 3a23a2b0..51d6f4db 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "lsif-util": "^0.2.15",
     "prettier": "^3.2.5",
     "semantic-release": "^17.0.8",
-    "typescript": "^3.9.7"
+    "typescript": "^5.9.3"
   },
   "dependencies": {
     "iterare": "^1.2.1",
diff --git a/yarn.lock b/yarn.lock
index 6f7aa2d6..3af47e24 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6511,11 +6511,16 @@ typescript-json-schema@^0.36.0:
     typescript "^3.0.1"
     yargs "^12.0.1"
 
-typescript@^3.0.1, typescript@^3.9.7:
+typescript@^3.0.1:
   version "3.9.7"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.7.tgz#98d600a5ebdc38f40cb277522f12dc800e9e25fa"
   integrity sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==
 
+typescript@^5.9.3:
+  version "5.9.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.9.3.tgz#5b4f59e15310ab17a216f5d6cf53ee476ede670f"
+  integrity sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==
+
 uglify-js@^3.1.4:
   version "3.6.7"
   resolved "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.7.tgz#15f49211df6b8a01ee91322bbe46fa33223175dc"