{{Infobox version
| title = Minecraft 1.21.1 Release Candidate 1
| image = 1.21.1-rc1.jpg
| image2 = Java Edition 1.21.1 Release Candidate 1.png
| edition = Java
| type = Release candidate
| date = August 7, 2024
| jsonhash = 4b60e080ee60e12408ea248cc494a37f6996d766 |jsonfile=1.21.1-rc1
| clienthash = ef1af29241ac595ddb545a98964e59643a5449d5
| clientmap = 48849b49e6e41b387b6244e04b0b42be1bcfdbf1
| serverhash = e56720aba46f7f07238c4c054a160fc942da9f78
| servermap = cb4cd0c731c91a37c7e3051945bd4f3f18791134
| parent = 1.21.1
| prevparent = 1.21
| prev = 
| next = 1.21.2
| nextparent = 
}}<onlyinclude>

'''1.21.1 Release Candidate 1''' (known as '''1.21.1-rc1''' in the [[launcher]]) is the first and only [[release candidate]] for [[Java Edition 1.21.1]], released on August 7, 2024,<ref name="mcnet">{{cite|url=https://www.minecraft.net/en-us/article/minecraft-1-21-1-release-candidate-1|title=Minecraft 1.21.1 Release Candidate 1|date=August 7, 2024|website=Minecraft.net}}</ref> which fixes two critical exploits including update suppression and adds two new [[language]]s.

== Additions ==
=== General ===
; New [[language]]s
* Added support for [[w:Tzotzil language|Tzotzil]] and [[w:Belarusian Latin alphabet|Belarusian (Latin)]] languages.

== Fixes ==

;Private issues
* Fixed block entity swap based [[Tutorials/Update suppression|update suppression]] as shown in this video: [https://youtu.be/77M8Adnxmsw].
* Fixed an exploit which allows modified clients to crash the server by requesting command completion for a malicious target selector input, causing a crash due to stack exhaustion.</onlyinclude>

== Video ==
{{slicedlime|jPlXRGcHsIA}}

== References ==
{{reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.2x}}

[[fr:Édition Java 1.21.1 Release Candidate 1]]
[[ja:Java Edition 1.21.1 Release Candidate 1]]
[[lzh:爪哇版一點二一點一之候一]]
[[pt:Edição Java 1.21.1 Release Candidate 1]]
[[ru:1.21.1 Release Candidate 1 (Java Edition)]]
[[uk:1.21.1 Release Candidate 1 (Java Edition)]]
[[zh:Java版1.21.1-rc1]]