diff --git a/src/UuidFactoryInterface.php b/src/UuidFactoryInterface.php
index 18c364c..46ebfd4 100644
--- a/src/UuidFactoryInterface.php
+++ b/src/UuidFactoryInterface.php
@@ -154,4 +154,31 @@ interface UuidFactoryInterface
      * @return UuidInterface A UuidInterface instance that represents a version 6 UUID
      */
     public function uuid6(?Hexadecimal $node = null, ?int $clockSeq = null): UuidInterface;
+
+    /**
+     * Returns a version 7 (Unix Epoch time) UUID
+     *
+     * @param DateTimeInterface | null $dateTime An optional date/time from which to create the version 7 UUID. If not
+     *     provided, the UUID is generated using the current date/time.
+     *
+     * @return UuidInterface A UuidInterface instance that represents a version 7 UUID
+     */
+    public function uuid7(?DateTimeInterface $dateTime = null): UuidInterface;
+
+    /**
+     * Returns a version 8 (custom format) UUID
+     *
+     * The bytes provided may contain any value according to your application's needs. Be aware, however, that other
+     * applications may not understand the semantics of the value.
+     *
+     * @param non-empty-string $bytes A 16-byte octet string. This is an open blob of data that you may fill with 128
+     *     bits of information. Be aware, however, bits 48 through 51 will be replaced with the UUID version field, and
+     *     bits 64 and 65 will be replaced with the UUID variant. You MUST NOT rely on these bits for your application
+     *     needs.
+     *
+     * @return UuidInterface A UuidInterface instance that represents a version 8 UUID
+     *
+     * @pure
+     */
+    public function uuid8(string $bytes): UuidInterface;
 }