May 11, 2018. Difficulty rose by +3.03% to 4.14T from 4.02T.
Change
+3.03%
New difficulty
4.14T
Period length
13.6 days
Network hashrate then (7-day)
29.7 EH/s
Bitcoin price then
$8,640
Hashprice then
$598/PH/day
The 2,016 blocks before it took 13.6 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 3.03%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.