diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae3d7ea..41d71ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+- Fix to validate alphanumeric CNPJ in my account
+
 ## [3.19.3] - 2025-10-30
 
 ### Fixed
diff --git a/react/__tests__/BRA.test.js b/react/__tests__/BRA.test.js
new file mode 100644
index 0000000..5b8955f
--- /dev/null
+++ b/react/__tests__/BRA.test.js
@@ -0,0 +1,52 @@
+import BRA from '../rules/BRA'
+
+const getCnpjField = () =>
+  BRA.businessFields.find(field => field.name === 'corporateDocument')
+
+describe('BRA corporateDocument (CNPJ)', () => {
+  const { mask, validate } = getCnpjField()
+
+  describe('mask', () => {
+    it('masks numeric CNPJ', () => {
+      expect(mask('11222333000181')).toBe('11.222.333/0001-81')
+    })
+
+    it('masks alphanumeric CNPJ', () => {
+      expect(mask('12ABC34501DE35')).toBe('12.ABC.345/01DE-35')
+    })
+
+    it('masks lowercase alphanumeric input', () => {
+      expect(mask('12abc34501de35')).toBe('12.abc.345/01de-35')
+    })
+  })
+
+  describe('validate', () => {
+    it('accepts valid numeric CNPJ', () => {
+      expect(validate('11.222.333/0001-81')).toBe(true)
+    })
+
+    it('accepts valid alphanumeric CNPJ', () => {
+      expect(validate('12.ABC.345/01DE-35')).toBe(true)
+    })
+
+    it('accepts unformatted valid CNPJ', () => {
+      expect(validate('11222333000181')).toBe(true)
+    })
+
+    it('rejects CNPJ with wrong length', () => {
+      expect(validate('11.222.333/0001')).toBe(false)
+    })
+
+    it('rejects numeric CNPJ with invalid check digits', () => {
+      expect(validate('11.222.333/0001-00')).toBe(false)
+    })
+
+    it('rejects alphanumeric CNPJ with invalid check digits', () => {
+      expect(validate('12.ABC.345/01DE-00')).toBe(false)
+    })
+
+    it('rejects repeated characters', () => {
+      expect(validate('00.000.000/0000-00')).toBe(false)
+    })
+  })
+})
diff --git a/react/rules/BRA.js b/react/rules/BRA.js
index ce8403e..dc1b80e 100644
--- a/react/rules/BRA.js
+++ b/react/rules/BRA.js
@@ -91,37 +91,28 @@ export default {
       name: 'corporateDocument',
       maxLength: 30,
       label: 'BRA_cnpj',
-      mask: value => msk.fit(value, '99.999.999/9999-99'),
+      mask: value => msk.fit(value, 'SS.SSS.SSS/SSSS-99'),
       validate: value => {
-        const cleanValue = value.replace(/[^\d]/g, '')
-        if (cleanValue.length != 14) return false
-
-        const isRepeatedNum = '0123456789'
-          .split('')
-          .some(digit => digit.repeat(14) === cleanValue)
-        if (isRepeatedNum) return false
-
-        const firstWeights = '543298765432'.split('')
-        const firstReduce = cleanValue
-          .split('')
+        const cleanValue = value.replace(/[.\/-]/g, '').toUpperCase()
+        if (cleanValue.length !== 14) return false
+        if (!/^[A-Z0-9]{12}\d{2}$/.test(cleanValue)) return false
+    
+        if (/^(.)\1+$/.test(cleanValue)) return false
+    
+        const getCharValue = char => char.charCodeAt(0) - 48
+        const values = cleanValue.split('').map(getCharValue)
+    
+        const firstWeights = [5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2]
+        const firstReduce = values
           .slice(0, 12)
-          .reduce(
-            (acc, cur, index) =>
-              acc + parseInt(cur) * parseInt(firstWeights[index]),
-            0,
-          )
+          .reduce((acc, cur, index) => acc + cur * firstWeights[index], 0)
         const firstDigit = firstReduce % 11 < 2 ? 0 : 11 - (firstReduce % 11)
         if (firstDigit != cleanValue.charAt(12)) return false
-
-        const secondWeights = ['6', ...firstWeights]
-        const secondReduce = cleanValue
-          .split('')
+    
+        const secondWeights = [6, ...firstWeights]
+        const secondReduce = values
           .slice(0, 13)
-          .reduce(
-            (acc, cur, index) =>
-              acc + parseInt(cur) * parseInt(secondWeights[index]),
-            0,
-          )
+          .reduce((acc, cur, index) => acc + cur * secondWeights[index], 0)
         const secondDigit = secondReduce % 11 < 2 ? 0 : 11 - (secondReduce % 11)
         return secondDigit == cleanValue.charAt(13)
       },