diff --git a/jest.config.js b/jest.config.js
index a24fa19..e850eb3 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -7,6 +7,6 @@ module.exports = {
     "**/?(*.)+(spec|test).ts"
   ],
   transform: {
-    "\\.ts$": "ts-jest"
+    "\\.ts$": ["ts-jest", { tsconfig: "tsconfig.test.json" }]
   },
 };
diff --git a/package-lock.json b/package-lock.json
index a6cb0c2..1cbf643 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -20,7 +20,7 @@
         "jest-fetch-mock": "3.0.3",
         "ts-jest": "29.4.9",
         "typedoc": "0.28.18",
-        "typescript": "5.9.3"
+        "typescript": "6.0.2"
       }
     },
     "node_modules/@asamuzakjp/css-color": {
@@ -4899,9 +4899,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.2.tgz",
+      "integrity": "sha512-bGdAIrZ0wiGDo5l8c++HWtbaNCWTS4UTv7RaTH/ThVIgjkveJt83m74bBHMJkuCbslY8ixgLBVZJIOiQlQTjfQ==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
diff --git a/package.json b/package.json
index d8a6aaf..1f36232 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "jest-fetch-mock": "3.0.3",
     "ts-jest": "29.4.9",
     "typedoc": "0.28.18",
-    "typescript": "5.9.3"
+    "typescript": "6.0.2"
   },
   "dependencies": {
     "url-template": "^2.0.8"
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 0000000..a1adc3b
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,12 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "types": ["jest", "node"]
+  },
+  "include": [
+    "**/*.test.ts"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
+}