diff --git a/jest.config.ts b/jest.config.js
similarity index 89%
rename from jest.config.ts
rename to jest.config.js
index a7cf275..0d9c650 100644
--- a/jest.config.ts
+++ b/jest.config.js
@@ -1,8 +1,7 @@
 // See: https://jestjs.io/docs/configuration
 
-import type { JestConfigWithTsJest } from 'ts-jest'
-
-const jestConfig: JestConfigWithTsJest = {
+/** @type {import('ts-jest').JestConfigWithTsJest} **/
+export default {
   clearMocks: true,
   collectCoverage: true,
   collectCoverageFrom: ['./src/**'],
@@ -39,5 +38,3 @@ const jestConfig: JestConfigWithTsJest = {
   },
   verbose: true
 }
-
-export default jestConfig
diff --git a/package.json b/package.json
index a785fa2..3b952b0 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     ".": "./dist/index.js"
   },
   "engines": {
-    "node": ">=21"
+    "node": ">=20"
   },
   "scripts": {
     "bundle": "npm run format:write && npm run package",
diff --git a/tsconfig.eslint.json b/tsconfig.eslint.json
index ffa9650..7a00c40 100644
--- a/tsconfig.eslint.json
+++ b/tsconfig.eslint.json
@@ -11,7 +11,7 @@
     "__tests__",
     "src",
     "eslint.config.mjs",
-    "jest.config.ts",
+    "jest.config.js",
     "rollup.config.ts"
   ]
 }