diff --git a/src/validator-docs/Formats/Cnpj.php b/src/validator-docs/Formats/Cnpj.php
index 250349e..365ea0b 100644
--- a/src/validator-docs/Formats/Cnpj.php
+++ b/src/validator-docs/Formats/Cnpj.php
@@ -8,6 +8,6 @@ class Cnpj implements ValidatorFormats
 {
     public static function validateFormat(string $value): bool
     {
-        return preg_match('/^\d{2}\.\d{3}\.\d{3}\/\d{4}-\d{2}$/', $value) > 0;
+        return preg_match('/^[A-Z\d]{2}\.[A-Z\d]{3}\.[A-Z\d]{3}\/[A-Z\d]{4}-\d{2}$/i', $value) > 0;
     }
 }
diff --git a/tests/ValidatorFormatsTest.php b/tests/ValidatorFormatsTest.php
index ffcd5a9..e4361a8 100644
--- a/tests/ValidatorFormatsTest.php
+++ b/tests/ValidatorFormatsTest.php
@@ -44,7 +44,10 @@ public function formatoCpf(): void
     public function formatoCnpj(): void
     {
         self::assertTrue($this->validatorFormats->execute('00.000.000/0000-00', 'cnpj'));
+        self::assertTrue($this->validatorFormats->execute('T6.JSP.XPS/0001-11', 'cnpj'));
+        self::assertTrue($this->validatorFormats->execute('t6.jsp.xps/0001-11', 'cnpj'));
         self::assertFalse($this->validatorFormats->execute('00000000000000', 'cnpj'));
+        self::assertFalse($this->validatorFormats->execute('T6.JSP.XPS/0001-1A', 'cnpj'));
     }
 
     /** @test */