Yes, Android 4.4 (KitKat) can be upgraded, but the ability to do so depends on several factors:

1. Device Manufacturer: The manufacturer of your device may provide official updates. Check their website or support page for information on available updates.
2. Carrier Restrictions: If your device is carrier-locked, the carrier might control the update process, and they may or may not provide the latest Android version.
3. Custom ROMs: If official updates are not available, you can consider installing a custom ROM, such as LineageOS, which can provide a newer version of Android. However, this process requires technical knowledge and can void your warranty.
4. Device Specifications: Some older devices may not have the hardware capabilities to support newer versions of Android, even if the software is available.

To check for updates on your device, go to Settings > About Phone > Software Updates. If an update is available, follow the prompts to install it.