Minecraft 1.21.5-pre1
Pre-releaseLegacy 1.xMinecraft 1.21.5-pre1 is a Java Edition pre-release released on 11 Mar 2025 under the classic 1.x numbering. Mojang lists Java 21 as the required runtime. It speaks network protocol 1073742063.
Minecraft 1.21.5 Pre-Release 1
Today we're shipping the first pre-release of Minecraft 1.21.5. From now on you will mostly see bug fixes and technical tweaks until the start of the next snapshot cycle. As we enter the pre-release phase we will be releasing more frequently than our regul
- Released
- 11 Mar 2025
- Requires Java
- Java 21+
- Protocol version
- 1073742063
- Data version
- 4320
- Version group
- 1.21
- Numbering
- Legacy (1.x)
- Server software
- 0 with builds
- Position
- #802 of 903
Official downloads
Served by Mojang. Verify the checksum before running anything.
| File | Size | SHA-1 | Download |
|---|---|---|---|
| Server jar | 54.6 MB | b663ce11b595… | piston-data.mojang.com ↗ |
| Client jar | 27.6 MB | 8b708817d199… | piston-data.mojang.com ↗ |
The catalogue on 1.21.5-pre1
Projects that name 1.21.5-pre1 in their own release metadata. Follow any of these to the full filtered list.
What runs on 1.21.5-pre1
Builds are counted from each project's own API; declared support comes from the loader's metadata.
| Software | Latest build | Published | Checksum | Download |
|---|---|---|---|---|
| Fabric Loader | 0.19.3 | Not build based | declared | loader |
| Quilt Loader | 0.30.1-beta.2 | Not build based | declared | loader |
Everything in 1.21
58 versions in this group.
| Version | Type | Protocol | Released |
|---|---|---|---|
| 1.21.11 | Release | 774 | 9 Dec 2025 |
| 1.21.11-rc3 | Release candidate | 1073742110 | 8 Dec 2025 |
| 1.21.11-rc2 | Release candidate | 1073742109 | 5 Dec 2025 |
| 1.21.11-rc1 | Release candidate | 1073742108 | 4 Dec 2025 |
| 1.21.11-pre5 | Pre-release | 1073742107 | 3 Dec 2025 |
| 1.21.11-pre4 | Pre-release | 1073742106 | 1 Dec 2025 |
| 1.21.11-pre3 | Pre-release | 1073742105 | 25 Nov 2025 |
| 1.21.11-pre2 | Pre-release | 1073742104 | 21 Nov 2025 |
| 1.21.11-pre1 | Pre-release | 1073742103 | 19 Nov 2025 |
| 1.21.10 | Release | 773 | 7 Oct 2025 |
| 1.21.10-rc1 | Release candidate | 1073742098 | 2 Oct 2025 |
| 1.21.9 | Release | 773 | 30 Sept 2025 |
| 1.21.9-rc1 | Release candidate | 1073742097 | 25 Sept 2025 |
| 1.21.9-pre4 | Pre-release | 1073742096 | 23 Sept 2025 |
| 1.21.9-pre3 | Pre-release | 1073742095 | 22 Sept 2025 |
| 1.21.9-pre2 | Pre-release | 1073742094 | 19 Sept 2025 |
| 1.21.9-pre1 | Pre-release | 1073742093 | 16 Sept 2025 |
| 1.21.8 | Release | 772 | 17 Jul 2025 |
| 1.21.8-rc1 | Release candidate | 1073742083 | 15 Jul 2025 |
| 1.21.7 | Release | 772 | 30 Jun 2025 |
| 1.21.7-rc2 | Release candidate | 1073742082 | 26 Jun 2025 |
| 1.21.7-rc1 | Release candidate | 1073742081 | 25 Jun 2025 |
| 1.21.6 | Release | 771 | 17 Jun 2025 |
| 1.21.6-rc1 | Release candidate | 1073742080 | 12 Jun 2025 |
| 1.21.6-pre4 | Pre-release | 1073742079 | 10 Jun 2025 |
| 1.21.6-pre3 | Pre-release | 1073742078 | 4 Jun 2025 |
| 1.21.6-pre2 | Pre-release | 1073742077 | 2 Jun 2025 |
| 1.21.6-pre1 | Pre-release | 1073742076 | 28 May 2025 |
| 1.21.5 | Release | 770 | 25 Mar 2025 |
| 1.21.5-rc2 | Release candidate | 1073742067 | 24 Mar 2025 |
| 1.21.5-rc1 | Release candidate | 1073742066 | 20 Mar 2025 |
| 1.21.5-pre3 | Pre-release | 1073742065 | 18 Mar 2025 |
| 1.21.5-pre2 | Pre-release | 1073742064 | 12 Mar 2025 |
| 1.21.5-pre1 | Pre-release | 1073742063 | 11 Mar 2025 |
| 1.21.4 | Release | 769 | 3 Dec 2024 |
| 1.21.4-rc3 | Release candidate | 1073742052 | 29 Nov 2024 |
| 1.21.4-rc2 | Release candidate | 1073742051 | 29 Nov 2024 |
| 1.21.4-rc1 | Release candidate | 1073742050 | 28 Nov 2024 |
| 1.21.4-pre3 | Pre-release | 1073742049 | 26 Nov 2024 |
| 1.21.4-pre2 | Pre-release | 1073742048 | 25 Nov 2024 |
| 1.21.4-pre1 | Pre-release | 1073742047 | 20 Nov 2024 |
| 1.21.3 | Release | 768 | 23 Oct 2024 |
| 1.21.2 | Release | 768 | 22 Oct 2024 |
| 1.21.2-rc2 | Release candidate | 1073742043 | 21 Oct 2024 |
| 1.21.2-rc1 | Release candidate | 1073742042 | 17 Oct 2024 |
| 1.21.2-pre5 | Pre-release | 1073742041 | 16 Oct 2024 |
| 1.21.2-pre4 | Pre-release | 1073742040 | 15 Oct 2024 |
| 1.21.2-pre3 | Pre-release | 1073742039 | 11 Oct 2024 |
| 1.21.2-pre2 | Pre-release | 1073742038 | 10 Oct 2024 |
| 1.21.2-pre1 | Pre-release | 1073742037 | 8 Oct 2024 |
| 1.21.1 | Release | 767 | 8 Aug 2024 |
| 1.21.1-rc1 | Release candidate | 1073742028 | 7 Aug 2024 |
| 1.21 | Release | 767 | 13 Jun 2024 |
| 1.21-rc1 | Release candidate | 1073742027 | 10 Jun 2024 |
| 1.21-pre4 | Pre-release | 1073742026 | 7 Jun 2024 |
| 1.21-pre3 | Pre-release | 1073742025 | 5 Jun 2024 |
| 1.21-pre2 | Pre-release | 1073742024 | 31 May 2024 |
| 1.21-pre1 | Pre-release | 1073742023 | 29 May 2024 |
Questions about Minecraft 1.21.5-pre1
What Java version does Minecraft 1.21.5-pre1 require?
Minecraft 1.21.5-pre1 requires Java 21 or newer. Mojang publishes this in the version metadata, so an older runtime refuses to start it.
What protocol version does Minecraft 1.21.5-pre1 use?
Minecraft 1.21.5-pre1 speaks protocol 1073742063. A client and a server can only connect when their protocol numbers match.
Where do I download the Minecraft 1.21.5-pre1 server jar?
Mojang hosts it directly. This page links to the official file with its SHA-1 checksum and size, so you can verify the download before you run it. We do not mirror or repackage it.
Go deeper
Metadata from Mojang’s official version manifest. Protocol and data versions from the PrismarineJS minecraft-data project.