Added

• CSV Reader - Best Guess for Encoding, and Handle Null-string Escape #1647

Changed

• Updated the CONVERT() function to support all current MS Excel categories and Units of Measure.

Deprecated

• Nothing.

Removed

• Nothing.

Fixed

• Fix for Xls Reader when SST has a bad length #1592
• Resolve Xlsx loader issue whe hyperlinks don't have a destination
• Resolve issues when printer settings resources IDs clash with drawing IDs
• Resolve issue with SLK long filenames #1612
• ROUNDUP and ROUNDDOWN return incorrect results for values of 0 #1627
• Apply Column and Row Styles to Existing Cells #1712 PR #1721
• Resolve issues with defined names where worksheet doesn't exist (#1686)[https://github.com/PHPOffice/PhpSpreadsheet/issues/1686] and #1723 - PR #1742
• Fix for issue #1735 Incorrect activeSheetIndex after RemoveSheetByIndex - PR #1743
• Ensure that the list of shared formulae is maintained when an xlsx file is chunked with readFilterIssue #169.
• Fix for notice during accessing "cached magnification factor" offset #1354
• Fix compatibility with ext-gd on php 8

Security Fix (CVE-2020-7776)

• Prevent XSS through cell comments in the HTML Writer.