July 25, 2015. Difficulty rose by +2.35% to 52.28B from 51.08B.
Change
+2.35%
New difficulty
52.28B
Period length
13.7 days
Network hashrate then (7-day)
0.4 EH/s
Bitcoin price then
$289
Hashprice then
$2,682/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 2.35%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.