v5.3.0.1
Official changelog:
- View recent and popular web apps in chats search.
- Open several web apps in different windows.
- Gift Telegram Stars to your friends.
- Send location marks and venues.
- Open tonsite:// links in webview.
- Edit order of stickers in your packs.

v5.4.1.1
Official changelog:
- Super Channels with post authors' profiles.
- Support favorite channels with Star Reactions.
- Channel Subnoscriptions with Stars monthly payments.

v5.5.4.1
Official changelog:
- Fix channel updates stopping after difference request failing.
- Add QR code generation for your username in Settings.
- Add mention link QR code sharing.
- Fix sending files from network drives. (Windows)
- Support two bottom buttons in web apps.
- Fix text layout outside of the message bubble glitch.
- Don't stop video when dragging media viewer in window mode.
- Fix crash in peer short info box.
- Star Giveaways.
- Swipe-to-Reply.
- Audio device selection in one-on-one calls.
- Text selection in collapsed / expanded quotes.

v5.6.1.1
Official changelog:
- Fix media viewer sometimes blocking the app after launch.
- Gifts for Telegram Stars.
- Mention / hashtag autocomplete in media caption field.
- Resizing the window used for web apps and games.
- "Include muted chats in folder counters" notifications setting.
- Emoji from Unicode 15.1.
- Allow drag-to-scroll in reply quote edit box.
- Add bot verified badge to web app noscript.
- Add ability to share QR code of bots.
- Add mention/hashtag autocomplete to Saved GIF caption.
- Fixed display of working hours in profiles.
- Respect the maximum reply quote length.
- Allow resizing the window used for web apps and games.
- Add mention / hashtag autocomplete in media caption field.
- Add "Include muted chats in folder counters" notifications setting.
- Auto-select URL suggested from clipboard when creating a custom link.
- Update emoji to Unicode 15.1.
- Fix replying with a quote from media album caption.
- Fix viewing custom emoji packs from media album caption.
- Suggest URL from clipboard when creating a custom link.
- Fix animated topic icons in topic info page.
- Fix excessive getChannelDifference requests.

v5.7.0.1
- Translate outgoing messages to the chat language (experimental)
Official changelog:
- Sending video messages.
- New video quality selection in channels.
- Adding media to sent text messages via Edit.
- Ads in bots with revenue sharing with bot developers.
- Chat-specific hashtags.
- Add ability to change page scale in Instant View pages.
- Fix unnecessary timestamp jump to a new line.
- Fix secondary button positioning in miniapps.
- Fix a crash in QR code copy for a chat without a photo.
- Fix a crash in share options menu showing.
- Fix a crash on monitor disconnect.
- Message selection marks.
- Better copy username / public link / ID menu in profiles.
- Keyboard navigation (Up/Down/PageUp/PageDown) in chat preview.
- Improved QR options for profile links.
- Fix calls color problems on Windows.
- Fix scroll problems on Linux.

v5.8.1.1
- Removed recent stickers limit
Official changelog:
- Updates in Mini Apps platform.
- Chat folders in forward and share boxes.
- Horizontal strip mode for chat folders.
- Fix recompressed video playback cutoff.
- Fix occasional redundant newlines before message timestamp.
- Remove playback speed change on settings button click.
- Fix video playback settings button on hidpi screens.
- Fix return from Picture-in-Picture to media viewer.
- Fix video quality auto-switching in Picture-in-Picture.
- Add message link to channel stars transaction information.
- Fix GIF playback in media viewer.
- Fix several possible crashes.

v5.9.0.1
- Use new icons in active sessions menu
Official changelog:
- Affiliate programs for bots.
- Add option to show folder tags in chats list.
- Ctrl+Click on Reply in groups to reply in another chat.
- Fix freeze on forward messages box opening.
- Improve phrases in bot subnoscriptions.
- Improve bottom label color in mini apps.
- Fix some fullscreen issues in mini apps.
- Fix miss-order of archived chats in forward box.
- Fix emoji status pack view from profile regression.

v5.10.3.1
Official changelog:
- Fix a crash in legacy group opening.
- Fix double verification badge in profiles.
- Show "Boost group the send messages" information.
- Fix several gifts bugs and glitches.
- Collectible Gifts.
- Reactions for Service Messages.
- Verification from Third Parties.
- Custom Emoji in Folder Names.

v5.11.1.1
- Use photos from @gamee in profile photo list (experimental)
Official changelog:
- Copy video links at current time.
- Set custom video covers when posting to channels.
- Send paid reactions from the name of your channels.
- Edit keyboard shortcuts in Settings > Chat Settings.
- Hide controls in calls with incoming video.
- Count all unread topics as a single chat in archive unread counter.
- Fix common groups section in bots profiles.
- Fix crash on scheduling messages from Share box.
- Add support for 'sound-file' notification hint on Linux.
- Add messages search in channel comments.
- Allow sending your unique gifts to blockchain.
- Add option for running in background on Linux.

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.