v5.1.1

Payments — You can now manage billing on the web. Register payment methods, check usage and remaining balance, and change plans all in one place — and cancel a scheduled downgrade before it takes effect.
Windows desktop app — The desktop app is now available on Windows.
Issue links — Link issues to one another as related, blocking, or duplicate. Links are also recorded in the issue activity history.
Quick document creation — Set a document's title, body, visibility, and labels at once from the new-document modal. Document comments are created, edited, and deleted in real time.
Quick-create button — Create issues, projects, documents, and other key items from a single + button at the top of any workspace screen.
co CLI commands — Added repository management (create, view, edit, delete, fork) and issue-link commands. (v1.0.2)

Stronger sensitive-data protection — Payment keys are stored encrypted, and logs mask sensitive data so it is never written in plain text.
More reliable billing — Recurring-payment retries and partial refunds are more accurate, and seat counts are now correctly reflected in cost when you change plans.
Automatic list pagination — Project, document, run, member, and repository lists no longer cut off at the end of a page and load in full without breaks.
Refined issue list — Made the issue list screen easier to read.
Improved document readability — Fixed the document body width and centered it.

Fixed an issue where upgrading a plan caused duplicate charges and a 502 error.
Fixed an issue where card registration was blocked in some workspaces.
Fixed an issue where registration failed in on-premises environments.
Fixed unstable comment anchors in documents.
Fixed an issue where document blocks could not be copied even when selected.
Fixed an issue where text was entered incorrectly after adding a hyperlink in a comment.
Fixed an issue where an issue did not appear in a sprint immediately after being assigned to it.
Fixed an issue where labeled items could not be selected in lists.
Fixed an issue where members were intermittently requested to be added twice.
Fixed an issue where the new-branch push banner kept showing even after a change request was created.
Fixed desktop app issues: an error while checking for updates, links not being clickable, and the search box staying open.