diff --git a/package.json b/package.json
index 6876914..ce8e6ad 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "prettier": "^3.9.6",
     "shx": "^0.4.0",
     "ts-node": "^10.9.2",
-    "typescript": "^5"
+    "typescript": "^6"
   },
   "engines": {
     "node": ">=18.0.0"
diff --git a/src/commands/version.ts b/src/commands/version.ts
index bd1edd3..21e1f60 100644
--- a/src/commands/version.ts
+++ b/src/commands/version.ts
@@ -2,7 +2,7 @@ import {Command, Flags, type Interfaces} from '@oclif/core'
 import {Ansis} from 'ansis'
 import {execFile} from 'node:child_process'
 import {EOL} from 'node:os'
-import {dirname, resolve} from 'node:path'
+import path from 'node:path'
 import which from 'which'
 
 const ansis = new Ansis()
@@ -24,15 +24,15 @@ async function getNpmDetails(pkg: string): Promise<false | NpmDetails> {
   return new Promise((resolve_) => {
     // Resolve npm from PATH only, excluding CWD. On Windows, both execFile (CreateProcess)
     // and the `which` module resolve executables from CWD before PATH.
-    const cwd = resolve(process.cwd())
+    const cwd = path.resolve(process.cwd())
     const npmPath = which.sync('npm', {nothrow: true})
-    if (!npmPath || dirname(resolve(npmPath)) === cwd) {
+    if (!npmPath || path.dirname(path.resolve(npmPath)) === cwd) {
       resolve_(false)
       return
     }
 
-    const useShell = /\.(cmd|bat)$/i.test(npmPath)
-    execFile(npmPath, ['view', pkg, '--json'], {shell: useShell}, (error, stdout) => {
+    const isUseShell = /\.(cmd|bat)$/iv.test(npmPath)
+    execFile(npmPath, ['view', pkg, '--json'], {shell: isUseShell}, (error, stdout) => {
       if (error) {
         resolve_(false)
       } else {
diff --git a/test/tsconfig.json b/test/tsconfig.json
index b9fdd63..01d9c8f 100644
--- a/test/tsconfig.json
+++ b/test/tsconfig.json
@@ -1,4 +1,7 @@
 {
   "extends": "../tsconfig",
-  "include": ["./**/*", "../src/**/*"]
+  "include": ["./**/*", "../src/**/*"],
+  "compilerOptions": {
+    "rootDir": "../"
+  }
 }
diff --git a/tsconfig.json b/tsconfig.json
index 7eef595..8e83355 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,7 +7,8 @@
     "noUnusedParameters": true,
     "outDir": "./lib",
     "pretty": true,
-    "rootDirs": ["./src"],
+    "rootDir": "./src",
+    "types": ["node", "mocha"],
     "strict": true,
     "target": "ES2024",
     "moduleResolution": "Node16"
diff --git a/yarn.lock b/yarn.lock
index 58f8ff4..c4e547a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5143,10 +5143,10 @@ typescript-eslint@^8.64.0, typescript-eslint@^8.66.0:
     "@typescript-eslint/typescript-estree" "8.67.0"
     "@typescript-eslint/utils" "8.67.0"
 
-typescript@^5:
-  version "5.7.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.7.3.tgz#919b44a7dbb8583a9b856d162be24a54bf80073e"
-  integrity sha512-84MVSjMEHP+FQRPy3pX9sTVV/INIex71s9TL2Gm5FG/WG1SqXeKyZ0k7/blY/4FdOzI12CBy1vGc4og/eus0fw==
+typescript@^6:
+  version "6.0.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-6.0.3.tgz#90251dc007916e972786cb94d74d15b185577d21"
+  integrity sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw==
 
 undici-types@~5.26.4:
   version "5.26.5"