Today Bitcoin’s mining difficulty has reached a new ath, increasing by 3.6%:

Bitcoin is now harder to mine than ever

The difficulty of mining a Bitcoin block ramped up by 3.6% today, marking an all-time high for the network. But the adjustment does put additional pressure on miners.

While not the most significant leap in difficulty adjustment history, the 3.6% hike brought Bitcoin’s total network difficulty to a record high of 17.56 trillion (T). The last time network difficulty came close to that figure was in July.

Full article here: https://decrypt.co/39662/bitcoin-is-now-harder-to-mine-than-ever