diff --git a/frontend/eslint.config.js b/frontend/eslint.config.js
index 8baf312..4a992da 100644
--- a/frontend/eslint.config.js
+++ b/frontend/eslint.config.js
@@ -32,4 +32,10 @@ export default [
       react: { version: 'detect' },
     },
   },
+  {
+    files: ['src/**/*.test.ts', 'src/**/*.test.tsx'],
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+    },
+  },
 ]
diff --git a/frontend/src/utils/dates.ts b/frontend/src/utils/dates.ts
index c6e032c..b9afe0d 100644
--- a/frontend/src/utils/dates.ts
+++ b/frontend/src/utils/dates.ts
@@ -41,7 +41,7 @@ export function parseInputDate(value: string): Date {
 /**
  * Type guard: check if a value is a valid date.
  */
-export function isValidDate(date: any): boolean {
+export function isValidDate(date: unknown): boolean {
   return date instanceof Date && !isNaN(date.getTime())
 }