New PacketEvents release here!
1.21 Minecraft released a while ago, we are here to publish our first official release that supports it. This release contains various additions and bug fixes. As always, this section is merely a _summary_ of the changes.

Please note that the declaration of the PacketEvents dependency has changed!
• Depending on pre‐built PacketEvents
• Shading PacketEvents

Changes
• 1.21 Minecraft support
• Gradle build chain reworked (with Kotlin DSL, also have Global Versioning)
• Add support for Mojang mapped JARs
• Add support for all versions of Adventure v4
• Added immutable views on the values within our registries
• Reworked PEVersion
• PacketEvents switched to the Paper API to optimize Folia functionality (The Spigot platform is still supported)
• ChatMessage_v1_19_1.ChatTypeBoundNetwork replaced with ChatType.Bound
• NBT and Component methods added to the ItemStack builder
• PacketEvents bStats setting is obsolete as it can be toggled within the configuration file created on the server
• PacketWrapper#writeVarInt optimization
• Event system optimization

Bug fixes
• Fix chat type mappings (1.19+)
• Fix Particle mappings for 1.12.2
• Fix Encoding the EncryptionResponse wrapper
• Fix SpigotConversionUtil#getEntityById for modern versions
• Fix Spigot Particle Conversion
• Fix Recipe Packet Read/Write
• Fix SoundEffect for legacy Minecraft versions
• Account for zero data in ChunkData packet (when unloading)
• Fix NPC#despawnAll, NPC#changeSkin
• Fix WrapperPlayServerJoinGame's reading of enforcesSecureChat
• Fix WrapperPlayServerChunkDataBulk not being copied from one listener to another
• Fix platform version detection on Velocity and BungeeCord
• Fix BungeeCord injector

Known issues
This PacketEvents update was a rather large one. We acknowledge that it still has a few issues and plan on fixing them in the upcoming patch update.
1. MappedEntity#isRegistered call leads to NullPointerException
Network synched registries are currently being worked on. < https://github.com/retrooper/packetevents/pull/866>
Completion of this task should lead to the issue being resolved.

2. EntityMetadata issues on 1.20.5+
Some metadata types (eg. spawned wolves) cause issues due to them being implemented incorrectly. Also this, we plan on fixing in the next patch update.

Help PacketEvents / Donations
Maintaining PacketEvents is not a simple process. The project has grown a lot and some of you have been here to witness it all. PacketEvents now has two additional maintainers: booky10 and AbhigyaKrishna. If you are willing to extend your kindness to them also, please reach out.