Why is AVAX going up?

I've noticed a significant upward trend in the price of AVAX recently. Could you explain what might be driving this increase? Is it due to some fundamental changes in the Avalanche network or perhaps a broader shift in the cryptocurrency market? I'm particularly interested in understanding if there are any specific events or announcements that might have sparked this upward momentum. Additionally, could you also comment on the sustainability of this upward trend and any potential risks or challenges that investors might face in the future?