diff --git a/src/Rfc4122/FieldsInterface.php b/src/Rfc4122/FieldsInterface.php
index a0cc4f4a..2241cf57 100644
--- a/src/Rfc4122/FieldsInterface.php
+++ b/src/Rfc4122/FieldsInterface.php
@@ -109,6 +109,7 @@ public function getVariant(): int;
      * 4. Randomly generated UUID
      * 5. Name-based UUID hashed with SHA-1
      * 6. Reordered time UUID
+     * 7. Unix Epoch time UUID
      *
      * This returns `null` if the UUID is not an RFC 4122 variant, since version
      * is only meaningful for this variant.
diff --git a/src/Rfc4122/Validator.php b/src/Rfc4122/Validator.php
index ed43c982..6b1f0de0 100644
--- a/src/Rfc4122/Validator.php
+++ b/src/Rfc4122/Validator.php
@@ -28,7 +28,7 @@
 final class Validator implements ValidatorInterface
 {
     private const VALID_PATTERN = '\A[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-'
-        . '[1-5]{1}[0-9A-Fa-f]{3}-[ABab89]{1}[0-9A-Fa-f]{3}-[0-9A-Fa-f]{12}\z';
+        . '[1-7][0-9A-Fa-f]{3}-[ABab89][0-9A-Fa-f]{3}-[0-9A-Fa-f]{12}\z';
 
     /**
      * @psalm-return non-empty-string
@@ -43,7 +43,8 @@ public function getPattern(): string
     public function validate(string $uuid): bool
     {
         $uuid = str_replace(['urn:', 'uuid:', 'URN:', 'UUID:', '{', '}'], '', $uuid);
+        $uuid = strtolower($uuid);
 
-        return $uuid === Uuid::NIL || preg_match('/' . self::VALID_PATTERN . '/Dms', $uuid);
+        return $uuid === Uuid::NIL || $uuid === Uuid::MAX || preg_match('/' . self::VALID_PATTERN . '/Dms', $uuid);
     }
 }
diff --git a/tests/Rfc4122/ValidatorTest.php b/tests/Rfc4122/ValidatorTest.php
index e8b97709..779de50d 100644
--- a/tests/Rfc4122/ValidatorTest.php
+++ b/tests/Rfc4122/ValidatorTest.php
@@ -30,7 +30,15 @@ public function testValidate(string $value, bool $expected): void
         $validator = new Validator();
 
         foreach ($variations as $variation) {
-            $this->assertSame($expected, $validator->validate($variation));
+            $this->assertSame(
+                $expected,
+                $validator->validate($variation),
+                sprintf(
+                    'Expected "%s" to be %s',
+                    $variation,
+                    $expected ? 'valid' : 'not valid',
+                ),
+            );
         }
     }
 
@@ -40,7 +48,7 @@ public function testValidate(string $value, bool $expected): void
     public function provideValuesForValidation(): array
     {
         $hexMutations = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e', 'f'];
-        $trueVersions = [1, 2, 3, 4, 5];
+        $trueVersions = [1, 2, 3, 4, 5, 6, 7];
         $trueVariants = [8, 9, 'a', 'b'];
 
         $testValues = [];
@@ -87,13 +95,25 @@ public function provideValuesForValidation(): array
                 'value' => "\nff6f8cb0-c57d-11e1-1b21-0800200c9a66\n",
                 'expected' => false,
             ],
+            [
+                'value' => '00000000-0000-0000-0000-000000000000',
+                'expected' => true,
+            ],
+            [
+                'value' => 'ffffffff-ffff-ffff-ffff-ffffffffffff',
+                'expected' => true,
+            ],
+            [
+                'value' => 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF',
+                'expected' => true,
+            ],
         ]);
     }
 
     public function testGetPattern(): void
     {
         $expectedPattern = '\A[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-'
-            . '[1-5]{1}[0-9A-Fa-f]{3}-[ABab89]{1}[0-9A-Fa-f]{3}-[0-9A-Fa-f]{12}\z';
+            . '[1-7][0-9A-Fa-f]{3}-[ABab89][0-9A-Fa-f]{3}-[0-9A-Fa-f]{12}\z';
 
         $validator = new Validator();