diff --git a/README.md b/README.md
index 23068f1..e63aff5 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,7 @@ Each item has emojis denoting:
 | [no-restricted-syntax](https://eslint.org/docs/latest/rules/no-restricted-syntax) | Enforces `switch` `case`'s content to be enclosed in braces |  | 🟢 |
 | [no-tabs](https://eslint.org/docs/latest/rules/no-tabs) | Disallows tabs | 🟠 | 🟢 |
 | [no-trailing-spaces](https://eslint.org/docs/latest/rules/no-trailing-spaces) | Disallows trailing whitespace at the end of lines | 🟠 | 🟢 |
+| [no-undef](https://eslint.org/docs/latest/rules/no-undef) | Disallows use of undeclared variables | 🟠 | 🟢 |
 | [no-unused-vars](https://eslint.org/docs/latest/rules/no-unused-vars) | Disallows unused variables | 🟠 | 🟢 |
 | [no-unsafe-optional-chaining](https://eslint.org/docs/latest/rules/no-unsafe-optional-chaining) | Disallows use of optional chaining in contexts where the `undefined` value is not allowed | 🟠 | 🟢 |
 | [object-curly-newline](https://eslint.org/docs/latest/rules/object-curly-newline) | Requires line breaks after opening and before closing braces | 🟠 | 🟢 |
diff --git a/package-lock.json b/package-lock.json
index 020af07..84c11ba 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "eslint-plugin-crisp",
-  "version": "1.0.73",
+  "version": "1.0.74",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "eslint-plugin-crisp",
-      "version": "1.0.73",
+      "version": "1.0.74",
       "license": "MIT",
       "dependencies": {
         "doctrine": "3.0.0",
diff --git a/package.json b/package.json
index 4a4fe1a..a2626e9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint-plugin-crisp",
-  "version": "1.0.73",
+  "version": "1.0.74",
   "description": "Custom ESLint Rules for Crisp",
   "author": "Crisp IM SAS",
   "main": "index.js",
diff --git a/recommended-vue.js b/recommended-vue.js
index 4dbbd57..611d0e7 100644
--- a/recommended-vue.js
+++ b/recommended-vue.js
@@ -94,6 +94,7 @@ module.exports = {
     ],
     "no-tabs": "error",
     "no-trailing-spaces": "error",
+    "no-undef": "error",
     "no-unused-vars": "warn",
     "no-unsafe-optional-chaining": "error",
     "object-curly-newline": [
diff --git a/recommended.js b/recommended.js
index c52e368..a0a8e41 100644
--- a/recommended.js
+++ b/recommended.js
@@ -95,6 +95,7 @@ module.exports = {
     "no-mixed-spaces-and-tabs": "error",
     "no-tabs": "error",
     "no-trailing-spaces": "error",
+    "no-undef": "error",
     "no-unused-vars": "warn",
     "no-unsafe-optional-chaining": "error",
     "object-curly-newline": [