JR East/West, Odakyu/Seibu/Tokyu/Keio/Sotetsu/Keikyu Railway will bring forward last train departures from next spring.
(as of November 30th)
JR East will announce the more detailed schedule and timetable in December.
On the other hand, JR West has already announced new timetable which will be revised next spring.
Odakyu: Last trains departing from Shinjuku will leave around 20 minutes earlier, they announced November 4th.
Seibu: Last trains (except for Yamaguchi Line and Tamagawa Line) will leave 20~30 minutes earlier, they announced on November 9th.
Tokyu: Last trains will leave 15~30 minutes earlier, they announced on November 10th.
Keio: Last trains will depart 10~30 minutes earlier, they announced on November 18th.
Sotetsu (Sagami railway): Last trains will leave 15~20 minutes earlier, they announced on November 19th.
Keikyu: Last trains will depart 15_30 minutes earlier from next spring, they announced on November 27th.
You will see the details scrolling down this page.
Source: 2021年春 首都圏における終電繰り上げ等のお知らせ