How to upgrade L4T 32.3.1 [ JetPack 4.3 ] to latest Jetpack version?

Hi, my current config is below;
NVIDIA Jetson Nano (Developer Kit Version)
L4T 32.3.1 [ JetPack 4.3 ]
Ubuntu 18.04.3 LTS
Kernel Version: 4.9.140-tegra
CUDA 10.0.326
CUDA Architecture: 5.3
OpenCV version: 4.1.1
OpenCV Cuda: NO
Vision Works:
VPI: 0.1.0
Vulcan: 1.1.70

How can I update my jetson nano jetpack and other sw(cuda, tensorrt etc.) to latest versions other way than flashing sd image??
Can I upgrade from apt-get ?

You can follow the “Updating from the NVIDIA APT Server” section.