diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 3a840a0..3c78fab 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -7,6 +7,9 @@ module.exports = {
   parserOptions: { ecmaVersion: 2022, sourceType: 'module' },
   ignorePatterns: ['dist', 'node_modules'],
   rules: {
-    '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+    '@typescript-eslint/no-unused-vars': [
+      'error',
+      { argsIgnorePattern: '^_', ignoreRestSiblings: true },
+    ],
   },
 };
diff --git a/src/core/config/env.ts b/src/core/config/env.ts
index ab970fa..06d4942 100644
--- a/src/core/config/env.ts
+++ b/src/core/config/env.ts
@@ -1,6 +1,9 @@
-import type { ZodSchema } from 'zod';
+import type { ZodType, ZodTypeDef } from 'zod';
 
-export function loadEnv<T>(schema: ZodSchema<T>, source: NodeJS.ProcessEnv = process.env): T {
+export function loadEnv<T>(
+  schema: ZodType<T, ZodTypeDef, unknown>,
+  source: NodeJS.ProcessEnv = process.env
+): T {
   const result = schema.safeParse(source);
   if (!result.success) {
     throw new Error(`Invalid environment configuration: ${result.error.message}`);