On October 25th, the cryptocurrency options trading platform Deribit announced important adjustments to its margin model variables to address possible rapid price and volatility changes. These adjustments aim to enhance the risk management framework and provide users with greater protection buffers. The main changes include:

1. The price range specifically designed for portfolio margin users will increase from 15% to 17.5% on October 27th at 9 AM UTC and further increase to 20% on October 30th.

2. The volatility range will be gradually increased by 5% daily, from 45% to 60%.

3. The Vega threshold for all users will be adjusted.

4. The futures leverage ratio for standard margin users will be reduced from 50x to 25x.

Deribit stated that they believe these adjustments will help create a safer trading environment and protect the market and its customers under more extreme market conditions.