diff --git a/package.json b/package.json
index e83fd9e..fa9b7a2 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,6 @@
   },
   "homepage": "https://github.com/stipsan/system-font-stack#readme",
   "devDependencies": {
-    "typescript": "^2.6.1"
+    "typescript": "^5.9.3"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index f502d06..20e0540 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,6 +2,7 @@
 # yarn lockfile v1
 
 
-typescript@^2.6.1:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.6.1.tgz#ef39cdea27abac0b500242d6726ab90e0c846631"
+typescript@^5.9.3:
+  version "5.9.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.9.3.tgz#5b4f59e15310ab17a216f5d6cf53ee476ede670f"
+  integrity sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==