diff --git a/package.json b/package.json
index 5ffa136..46b272c 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "jest": "^29.7.0",
     "jest-resolve": "^30.0.2",
     "ts-jest": "^29.4.0",
-    "typescript": "^5.8.3",
+    "typescript": "^5.9.3",
     "vega": "^5.13.0",
     "vega-embed": "^6.10.0",
     "vega-lite": "^6.0.0",
diff --git a/yarn.lock b/yarn.lock
index 58b69bd..67b1e85 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2871,10 +2871,10 @@ type-fest@^4.41.0:
   resolved "https://registry.npmjs.org/type-fest/-/type-fest-4.41.0.tgz#6ae1c8e5731273c2bf1f58ad39cbae2c91a46c58"
   integrity sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA==
 
-typescript@^5.8.3:
-  version "5.8.3"
-  resolved "https://registry.npmjs.org/typescript/-/typescript-5.8.3.tgz#92f8a3e5e3cf497356f4178c34cd65a7f5e8440e"
-  integrity sha512-p1diW6TqL9L07nNxvRMM7hMMw4c5XOo/1ibL4aAIGmSAt9slTE1Xgw5KWuof2uTOvCg9BY7ZRi+GaF+7sfgPeQ==
+typescript@^5.9.3:
+  version "5.9.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.9.3.tgz#5b4f59e15310ab17a216f5d6cf53ee476ede670f"
+  integrity sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==
 
 undici-types@~7.8.0:
   version "7.8.0"