diff --git a/package.json b/package.json
index 7f8a6b7c..b90210af 100644
--- a/package.json
+++ b/package.json
@@ -92,7 +92,7 @@
     "markdownlint-cli2": "^0.18.1",
     "rxjs": "^7.8.2",
     "tsup": "^8.5.0",
-    "typescript": "~5.8.3",
+    "typescript": "~5.9.3",
     "typescript-eslint": "^8.46.2",
     "vite": "^6.3.5",
     "vitest": "^3.2.4"
diff --git a/yarn.lock b/yarn.lock
index 92f36433..f4334949 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2208,7 +2208,7 @@ __metadata:
     ts-api-utils: "npm:^2.0.0"
     tslib: "npm:^2.1.0"
     tsup: "npm:^8.5.0"
-    typescript: "npm:~5.8.3"
+    typescript: "npm:~5.9.3"
     typescript-eslint: "npm:^8.46.2"
     vite: "npm:^6.3.5"
     vitest: "npm:^3.2.4"
@@ -4688,23 +4688,23 @@ __metadata:
   languageName: node
   linkType: hard
 
-"typescript@npm:~5.8.3":
-  version: 5.8.3
-  resolution: "typescript@npm:5.8.3"
+"typescript@npm:~5.9.3":
+  version: 5.9.3
+  resolution: "typescript@npm:5.9.3"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 10c0/5f8bb01196e542e64d44db3d16ee0e4063ce4f3e3966df6005f2588e86d91c03e1fb131c2581baf0fb65ee79669eea6e161cd448178986587e9f6844446dbb48
+  checksum: 10c0/6bd7552ce39f97e711db5aa048f6f9995b53f1c52f7d8667c1abdc1700c68a76a308f579cd309ce6b53646deb4e9a1be7c813a93baaf0a28ccd536a30270e1c5
   languageName: node
   linkType: hard
 
-"typescript@patch:typescript@npm%3A~5.8.3#optional!builtin<compat/typescript>":
-  version: 5.8.3
-  resolution: "typescript@patch:typescript@npm%3A5.8.3#optional!builtin<compat/typescript>::version=5.8.3&hash=5786d5"
+"typescript@patch:typescript@npm%3A~5.9.3#optional!builtin<compat/typescript>":
+  version: 5.9.3
+  resolution: "typescript@patch:typescript@npm%3A5.9.3#optional!builtin<compat/typescript>::version=5.9.3&hash=5786d5"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 10c0/39117e346ff8ebd87ae1510b3a77d5d92dae5a89bde588c747d25da5c146603a99c8ee588c7ef80faaf123d89ed46f6dbd918d534d641083177d5fac38b8a1cb
+  checksum: 10c0/ad09fdf7a756814dce65bc60c1657b40d44451346858eea230e10f2e95a289d9183b6e32e5c11e95acc0ccc214b4f36289dcad4bf1886b0adb84d711d336a430
   languageName: node
   linkType: hard