Sourced from postcss's releases.

8.5.23

• Do not load source map without opts.from for security reasons.

8.5.22

• Fixed custom property losing semicolon before a comment (by @​sarathfrancis90).

8.5.21

• Fixed childless at-rule losing semicolon before comment (by @​sarathfrancis90).
• Fixed docs (by @​isker).

8.5.20

• Fixed missing space if AtRule#params is set after (by @​sarathfrancis90).
• Fixed mixing AST error on warnings (by @​MahinAnowar).

8.5.19

• Fixed cleaning before for new nodes inserted to Root (by @​MahinAnowar).

8.5.18

• Restricted loading previous source maps file to the opts.from folder for security reasons (use unsafeMap: true to disable the check).

8.5.17

• Fixed Maximum call stack size exceeded error.
• Fixed Prototype hijacking for postcss.fromJSON().
• Fixed Input#origin() for unmapped end position (by @​chatman-media).

8.5.16

• Fixed Input#origin() position (by @​mizdra).
• Fixed raws after rehydrating a JSON AST (by @​sarathfrancis90).
• Fixed putting parent-less node in nodes of new node (by @​MahinAnowar).
• Fixed computing offset in positionBy() (by @​greymoth-jp).
• Fixed rangeBy() on index: 0 (by @​sarathfrancis90).

8.5.15

• Fixed declaration parsing performance (by @​homanp).

8.5.14

• Fixed custom syntax regression (by @​43081j).

8.5.13

• Fixed postcss-scss commend regression.

8.5.12

• Fixed reading any file via user-generated CSS.
• Added opts.unsafeMap to disable checks.

8.5.11

• Fixed nested brackets parsing performance (by @​offset).

8.5.10

• Fixed XSS via unescaped </style> in non-bundler cases (by @​TharVid).

... (truncated)

Sourced from postcss's changelog.

8.5.23

• Do not load source map without opts.from for security reasons.

8.5.22

• Fixed custom property losing semicolon before a comment (by @​sarathfrancis90).

8.5.21

• Fixed childless at-rule losing semicolon before comment (by @​sarathfrancis90).
• Fixed docs (by @​isker).

8.5.20

• Fixed missing space if AtRule#params is set after (by @​sarathfrancis90).
• Fixed mixing AST error on warnings (by @​MahinAnowar).

8.5.19

• Fixed cleaning before for new nodes inserted to Root (by @​MahinAnowar).

8.5.18

• Restricted loading previous source maps file to the opts.from folder for security reasons (use unsafeMap: true to disable the check).

8.5.17

• Fixed Maximum call stack size exceeded error.
• Fixed Prototype hijacking for postcss.fromJSON().
• Fixed Input#origin() for unmapped end position (by @​chatman-media).

8.5.16

• Fixed Input#origin() position (by @​mizdra).
• Fixed raws after rehydrating a JSON AST (by @​sarathfrancis90).
• Fixed putting parent-less node in nodes of new node (by @​MahinAnowar).
• Fixed computing offset in positionBy() (by @​greymoth-jp).
• Fixed rangeBy() on index: 0 (by @​sarathfrancis90).

8.5.15

• Fixed declaration parsing performance (by @​homanp).

8.5.14

• Fixed custom syntax regression (by @​43081j).

8.5.13

... (truncated)

• eb9e1fe Release 8.5.23 version
• 9d19c78 Update dependencies
• 7beca13 Does no load source map file without opts.from
• decea51 Typo
• c18e30d Update EM banner
• 98a39ad Update EM banner
• a3e48c4 Release 8.5.22 version
• f49d691 Fix custom property losing its semicolon before a comment (#2117)
• 28e0daf Release 8.5.21 version
• 3d2b4e4 Update dependencies
• Additional commits viewable in compare view

This version was pushed to npm by GitHub Actions, a new releaser for postcss since your current version.