v5.12.2.1
- Mention multiple users at once with right click or tab
- Show photo/file datacenter and original date
Official changelog:
- Set a fee for incoming messages from unknown users.
- Set a fee for messages in groups or channel comments.
- Show some information about who's messaging you.
- Pin gifts on your profile.

v5.12.5.1
Official changelog:
- Support swipe navigation on touchscreens.
- Close main menu by swipe navigation.
- Always use app ID based icon name on linux.
- Fix a couple more crashes.
- Fix gift disappearing on unpin.
- Fix country emoji for Fragment numbers.

v5.13.1.1
Official changelog:
- Allow transferring my unique gifts from Send Gift section.
- Edit type of gifts you accept in Settings > Privacy and Security.
- Swipe navigation using swipe gesture on touchpads / touchscreens.
- Choose chat list quick action for swipe or middle click.

v5.14.2.1
Official changelog:
- Buy Rare Gifts in the Marketplace.
- Sell Your Gifts for Stars.
- Set Your Channel to Auto-Translate.
- Secure Group Calls Made Easy.
- Automated Business Accounts.
- New Gifts Settings.

v5.14.3.1
- Show photo platform in media viewer
- Fix getting sticker pack author for newer ids
- Material Design 3 styled folders
Official changelog:
- Fix stale birthday suggestions removing.
- Fix notification click opening a new window.

v5.15.2.1
Official changelog:
- Send Direct Messages to Channels.
- Enable New Tab Layout for Topics.
- Create Polls with Up To 12 Options.
- Add statistics for user stars.

v5.16.0.1
- Improved voice messages bitrate (32 to 128)
- Removed delay when recording voice messages
- Reduced chat preview delay
Official changelog:
- Create private and group checklists.
- Suggest Posts in Channels.
- Monetizing via Suggested Posts.

v5.16.1.1
Official changelog:
- Fix inline keyboard updating in bot messages.
- Fix possible crash in fast chat switching.
- Different minor fixes.

v5.16.4.1
- Show more info for unique gifts
- 256 bitrate in voice messages
- Hide phone number for non-contacts in top bar
Official changelog:
- Allow removing / charging fee in channel direct messages.
- Don't offer creating checklists in channels.
- Support author channel in gifts.

v5.16.6.1
Official changelog:
- Age verification support.

i don't know why they didn't mention in the changelog that this update adds gift collections in profiles and support for purchasing new (not yet released) gifts
group calls have also been fixed

v6.0.0.1
Official changelog:
- Public Post Search.
- Story Albums.
- Gift Collections.
- Profile Rating.

v6.1.0.1
Official changelog:
- Music on Profiles.
- Gift Themes.
- Gift Value Information.
- Upgrading Gifts for Other Users.

v6.2.2.1
Official changelog:
- Comments and reactions in group calls.
- Notes for contacts.
- Suggested birthdays.
- Threads for AI bots.
- Reorder gifts collections and stories albums.
- Reorder gifts inside collections.
- Apply tags instantly when forwarding to Saved Messages.
- Choose which screen to show notifications on.
- Nice text message sending animation.

v6.2.3.1
Official changelog:
- Fix crash when viewing messages with hidden senders.
- Fix possible crash when editing contacts.
- Fix layout of character count warning in contact notes.
- Fix icons when editing contacts.
- Fix color of sending messages animation in complex themes.
- Fix crash in chat open on Flatpak build.