July 11, 2015. Difficulty rose by +3.39% to 51.08B from 49.40B.
Change
+3.39%
New difficulty
51.08B
Period length
13.6 days
Network hashrate then (7-day)
0.4 EH/s
Bitcoin price then
$285
Hashprice then
$2,674/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 3.39%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.