diff --git a/package.json b/package.json
index ad28374..38db6a3 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@types/node": "^25.6.2",
     "tsx": "^4.21.0",
-    "typescript": "^5.9.3"
+    "typescript": "^6.0.3"
   },
   "keywords": [
     "stratify",