#❗-1-18
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We are aware that Spigot has released a pre-release build for 1.18-pre5. Paper will begin its update process in the coming days.
Please Note: Spigot's pre-release build is unstable and should NOT be used on your production servers.
Paper's master branch is now frozen, and we will not merge any PRs until 1.18 is released. We have created a new dev/1.18 branch to track development for this update, which we are starting on now using the snapshot.
You will also be able to follow our development progress in https://github.com/PaperMC/Paper/issues/6136
We have started the patch updating process. While we might not be working on it all the time, you can follow https://www.twitch.tv/paperpowered to watch parts of the update process, or join the voicechat on our Discord server! 
Official twitch.tv channel of the PaperMC project. Find more information on papermc.io
We're now at 250 of roughly 850 server patches! ... but note that not every patch takes the same amount of time, especially the later ones will take longer, so don't expect production-ready builds anytime super soon.
We're now at 400 patches. We're also live, hosted through the paperpowered Twitch channel again (and if we're not, you can follow it anyways)!
Over 700 server patches are done. A good few of the more important performance patches as well as proper runtime tests are still missing, so we're not quite done yet (we're currently live again btw). 
Paperclip has been updated to support 1.18 bundler jars, however work is still ongoing to update paperweight to be able to build these bundler jars. No test builds can be published without that part of the build process working, but it's almost done.
The amount of patches left has shrunken to about 2 dozen, mostly performance related patches. Bundler jars now work and are being finalized in the coming day(s), so you can expect preliminary, experimental test builds of the 1.18 pre-releases soon™️.
Note for developers: Instead of using shadowJar and reobfJar Gradle tasks, you need the createBundlerJar and createReobfBundlerJar tasks and have to take the jar out of the project root's build/libs directory in order to get runnable jars (as of right now at least).
Experimental test builds have arrived 
While a few larger performance patches are still missing, we would like to get some initial feedback on the updated Paper server for 1.18-rc3. Below, you can find a Paperclip jar compatible with 1.18-rc3 clients.
(removed)
SHA256 file hash: b2e0365eaad6b4056d64105350492b570ee3c6d788662021776cd572059ad65e
If you want a Mojang mapped server, you can use this (if you don't know what that means, use the first link from above):
(removed)
SHA256 file hash: 29572af11b44ee2a882ffc111d028d25f61a22abf931ec1632450a917bbef945
❗THESE BUILDS ARE NOT MEANT TO BE RUN IN PRODUCTION❗
The purpose of this is to find bugs and crashes that have sneaked in during the update and to see if your plugins still work; if you encounter any issues, please report them on the GH issue tracker by filling out the template as usual: https://github.com/PaperMC/Paper/issues/new/choose - please also specify whether you are running the reobf or mapped version.
Do not run these without backups of your original server/worlds, this might permanently corrupt your worlds otherwise and version upgrades are irreversible 
Last updated November 29th to version 3
We have also published the preliminary API to our repo, you can use it to update your plugins:
compileOnly("io.papermc.paper:paper-api:1.18-rc3-R0.1-SNAPSHOT")
<dependency>
<groupId>io.papermc.paper</groupId>
<artifactId>paper-api</artifactId>
<version>1.18-rc3-R0.1-SNAPSHOT</version>
<scope>provided</scope>
</dependency>
The experimental 1.18-rc3 jars have been updated, fixing issues with mob spawning and hoppers; see 2 messages above (still experimental; make backups; don't use them in production). They're half the size of the previous jars since Paperclip has been updated to support its previous behavior aside from the new 1.18 jar bundling. Below the links you can also find their SHA256 file hashes now, just in case.
The experimental 1.18-rc3 jars have been updated again, fixing some issues and most notably, readding the anti-xray patch; see 3 messages above. Have fun with that (still experimental; make backups; don't use them in production)!
Also; check the default max-block-height of the xray setting in the Paper config, since ores can now generate much higher than before.
We cannot update to RC 4 until Spigot does so. We are also in no capacity to estimate when we’re ready after tomorrow’s full release. Please do not ask for ETAs or the likes; there is none to give.
We are aware of both Vanilla and Spigot having updated to 1.18. Kenny is hard at work in updating. Follow along on his adventures! https://www.twitch.tv/paperpowered (click the right arrow to switch to the hosting mode :p)
Official twitch.tv channel of the PaperMC project. Find more information on papermc.io
Builds are now available on the https://papermc.io/downloads site; see #announcements for more info and future announcements regarding 1.18.
❗ These builds are still experimental, so don't forget to make backups and do not use them in production environments ❗
Do note that due to caching, you may need to force refresh the page (ctrl-F5, or shift click the refresh button, generally)
There is no ETAs for a "stable" release. Repeat, THERE ARE NO ETAS!
1.18 servers allow 1.18.1 clients to connect, as well as the other way around. The most important fix the 1.18.1 server contains has already been implemented in Paper, so there is no rush to get this update. After Spigot has updated, we will follow soon after.
You should update your clients tho asap!
Kenny is live again streaming the 1.18.1 update process: https://www.twitch.tv/kennytvn
Paper 1.18.1 builds are now available on our website: https://papermc.io/downloads
You might have to hit Ctrl+F5 due to caching™️, but otherwise it will appear soon™️
... turns out we need to make one small adjustment to the ci before it actually takes the 1.18.1 builds, sorry! We'll let you know when that happens. 
Now it's actually out; starting from build #68, 1.18.1 is available on https://papermc.io/downloads. 
Since a few people have been asking about when Paper will be stable, with some forks having announced themselves to be: Paper IS NOT confirmed stable yet and there is no ETA on when it will be, even if we have already left the experimental stage - it could be in a few days, it could also be in a few weeks. This includes all forks of Paper as well as Spigot ❗
If you personally haven't encountered anything, that doesn't mean there are no important issues left. See the still ongoing bugfixes, including fixes to Spigot code.