October 29, 2015. Difficulty rose by +2.25% to 62.25B from 60.88B.
Change
+2.25%
New difficulty
62.25B
Period length
13.7 days
Network hashrate then (7-day)
0.5 EH/s
Bitcoin price then
$305
Hashprice then
$2,300/PH/day
The 2,016 blocks before it took 13.7 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 2.25%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.