22.00

• 7-Zip now can extract APFS (Apple File System) images that can be used in DMG files.
• 7-Zip now can create TAR archives in POSIX (pax) tar format with the switches
• -ttar -mm=pax or -ttar -mm=posix
• 7-Zip now can store additional file timestamps with high precision (1 ns in Linux) in tar/pax archives with the following switches:
• -ttar -mm=pax -mtp=3 -mtc -mta
• New switches for Linux version for TAR archives:
• -snoi : store owner/group ids in archive or set owner/group ids from archive to extracted files.
• -snon : store owner/group names in archive
• New -snz switch to propagate Zone.Identifier stream to extracted files (Windows).
• New option "Propagate Zone.Id stream" in Tools/Options/7-Zip menu.
• New "Options" window in "Add to archive" allows to select what metadata must be included to archive. Also it allows to select new option
• "Do not change source files last access time".
• Some bugs were fixed.

21.07

• The sorting order of files in archives was slightly changed to be more consistent
  for cases where the name of some directory is the same as the prefix part of the name
  of another directory or file.
• TAR archives created by 7-Zip now are more consistent with archives created by GNU TAR program.

21.02

21.02 alpha 2021-05-06

• 7-Zip now writes additional field for filename in UTF-8 encoding to zip archives.
  It allows to extract correct file name from zip archives on different systems.
• The command line version of 7-Zip for macOS was released.
• The speed for LZMA and LZMA2 decompression in arm64 versions for macOS and Linux
  was increased by 20%-60%.
• Some changes and improvements in ZIP, TAR and NSIS code.

21.01 alpha 2021-03-09

• The command line version of 7-Zip for Linux was released.
• The improvements for speed of ARM64 version using hardware CPU instructions
  for AES, CRC-32, SHA-1 and SHA-256.
• The bug in versions 18.02 - 21.00 was fixed:
  7-Zip could not correctly extract some ZIP archives created with xz compression method.
• Some bugs were fixed.

20.02 alpha 2020-08-08

• The default number of LZMA2 chunks per solid block in 7z archive was increased to 64.
  It allows to increase the compression speed for big 7z archives, if there is a big number
  of CPU cores and threads.
• The speed of PPMd compressing/decompressing was increased for 7z/ZIP/RAR archives.
• The new -ssp switch. If the switch -ssp is specified, 7-Zip doesn't allow the system
  to modify "Last Access Time" property of source files for archiving and hashing operations.
• Some bugs were fixed.

20.00 alpha 2020-02-06

• 7-Zip now supports new optional match finders for LZMA/LZMA2 compression: bt5 and hc5,
  that can work faster than bt4 and hc4 match finders for the data with big redundancy.
• The compression ratio was improved for Fast and Fastest compression levels with the
  following default settings:
  • Fastest level (-mx1) : hc5 match finder with 256 KB dictionary.
  • Fast level (-mx3) : hc5 match finder with 4 MB dictionary.
• Minor speed optimizations in multithreaded LZMA/LZMA2 compression for Normal/Maximum/Ultra
  compression levels.
• bzip2 decoding code was updated to support bzip2 archives, created by lbzip2 program.

19.00

• Encryption strength for 7z archives was increased:
  the size of random initialization vector was increased from 64-bit to 128-bit,
  and the pseudo-random number generator was improved.
• Some bugs were fixed.

18.06

• The speed for LZMA/LZMA2 compressing was increased by 3-10%,
  and there are minor changes in compression ratio.
• Some bugs were fixed.
• The bug in 7-Zip 18.02-18.05 was fixed: there was memory leak in xz decoder.
• 7-Zip 18.02-18.05 used only one CPU thread for bz2 archive creation.

18.05

• The speed for LZMA/LZMA2 compressing was increased
  by 8% for fastest/fast compression levels and
  by 3% for normal/maximum compression levels.
• 7-Zip now shows Properties (Info) window and CRC/SHA results window
  as "list view" window instead of "message box" window.
• Some improvements in zip, hfs and dmg code.
• Previous versions of 7-Zip could work incorrectly in "Large memory pages" mode in
  Windows 10 because of some BUG with "Large Pages" in Windows 10.
  Now 7-Zip doesn't use "Large Pages" on Windows 10 up to revision 1709 (16299).
• The vulnerability in RAR unpacking code was fixed (CVE-2018-10115).
• Some bugs were fixed.

18.03

• The speed for single-thread LZMA/LZMA2 decoding
  was increased by 30% in x64 version and by 3% in x86 version.
• 7-Zip now can use multi-threading for 7z/LZMA2 decoding,
  if there are multiple independent data chunks in LZMA2 stream.
• 7-Zip now can use multi-threading for xz decoding,
  if there are multiple blocks in xz stream.
• New localization: Kabyle.
• Some bugs were fixed.

18.01

• 7-Zip now can unpack DMG archives that use LZFSE compression method.
• 7-Zip now doesn't allow update operation for archives that have read-only attribute.
• The BUG was fixed:
  extracting from tar with -si switch didn't set timestamps for directories.
• Some bugs were fixed.

18.00

Includes security fixes: https://landave.io/2018/01/7-zip-multiple-memory-corruptions-via-rar-and-zip

• 7-Zip now can unpack OBJ/COFF files.
• new -sse switch to stop archive creating, if 7-Zip can't open some input file.
• Some bugs were fixed.