diff --git a/.eslintrc.json b/.eslintrc.json
index 122b047..719a846 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,7 +1,7 @@
 {
   "env": {
     "browser": true,
-    "es2021": true,
+    "es6": true,
     "jest": true,
     "node": true
   },
@@ -12,14 +12,14 @@
   ],
   "parser": "@typescript-eslint/parser",
   "parserOptions": {
-    "ecmaVersion": 12,
+    "ecmaVersion": 2015,
     "sourceType": "module"
   },
   "plugins": [
     "@typescript-eslint"
   ],
   "rules": {
-    "@typescript-eslint/explicit-module-boundary-types": "on",
-    "@typescript-eslint/no-explicit-any": "error"
+    "@typescript-eslint/explicit-module-boundary-types": "error",
+    "@typescript-eslint/no-explicit-any": "warn"
   }
 }
diff --git a/src/card.ts b/src/card.ts
index 5cab406..9c3ed40 100644
--- a/src/card.ts
+++ b/src/card.ts
@@ -196,7 +196,7 @@ export default async function card(data: GetData, uiConfig: UiConfig): Promise<s
   const isRevert = parseBoolean(uiConfig.Revert || false);
 
   // Card title
-  let titleCard = (uiConfig.Title && uiConfig.Title !== "undefined")
+  const titleCard = (uiConfig.Title && uiConfig.Title !== "undefined")
     ? uiConfig.Title.split("{name}").join(data.name)
     : (selectedLocale.titleCard).split("{name}").join(data.name);