Minecraft 1.21.3
ReleaseLegacy 1.xMinecraft 1.21.3 is a Java Edition full release released on 23 Oct 2024 under the classic 1.x numbering. Mojang lists Java 21 as the required runtime. It speaks network protocol 768.
Minecraft: Java Edition 1.21.3
Coming in hot with a hotfix, here's Minecraft 1.21.3 with a fix for a critical issue affecting Realms with Resource Packs enabled.This version also fixes an upgrade problem with all Salmon turning small. This version will upgrade any small Salmon from prev
- Released
- 23 Oct 2024
- Requires Java
- Java 21+
- Protocol version
- 768
- Data version
- 4082
- Version group
- 1.21
- Numbering
- Legacy (1.x)
- Server software
- 12 with builds
- Position
- #781 of 903
Official downloads
Served by Mojang. Verify the checksum before running anything.
| File | Size | SHA-1 | Download |
|---|---|---|---|
| Server jar | 53.5 MB | 45810d238246… | piston-data.mojang.com ↗ |
| Client jar | 26.6 MB | 6f67d19b4467… | piston-data.mojang.com ↗ |
Versions that can connect to each other
Protocol 768 is shared by these versions, so their clients and servers can talk to each other.
The catalogue on 1.21.3
Projects that name 1.21.3 in their own release metadata. Follow any of these to the full filtered list.
What runs on 1.21.3
Builds are counted from each project's own API; declared support comes from the loader's metadata.
| Software | Latest build | Published | Checksum | Download |
|---|---|---|---|---|
| ASPaper | #16529 | 20 Dec 2024 | Not published | jar ↗ |
| Canvas | #622 | 24 Nov 2024 | Not published | jar ↗ |
| DivineMC | #418 | 4 Dec 2024 | Not published | jar ↗ |
| Leaf | #1 | 19 Feb 2025 | Not published | jar ↗ |
| Leaves | #91 | 23 Jan 2025 | Not published | jar ↗ |
| LooHP Limbo | #47 | 26 Oct 2024 | Not published | jar ↗ |
| Paper | #83 | 28 Mar 2025 | 87e973e1d338… | jar ↗ |
| Pluto | #5 | 23 Mar 2025 | Not published | jar ↗ |
| Pufferfish | #27 | 4 Dec 2024 | Not published | jar ↗ |
| Purpur | #2358 | 4 Dec 2024 | Not published | jar ↗ |
| Spigot | #4398 | 3 Dec 2024 | Not published | jar ↗ |
| Sponge | #76 | 28 Jul 2026 | Not published | jar ↗ |
| Pufferfish | #27 | Not build based | inferred | loader |
| Spigot | #4398 | Not build based | inferred | loader |
| DivineMC | #418 | Not build based | inferred | loader |
| ASPaper | #16529 | Not build based | inferred | loader |
| LooHP Limbo | #47 | Not build based | inferred | loader |
| Sponge | 1.21.3-13.0.1-RC2249 | Not build based | inferred | loader |
| Canvas | #622 | Not build based | inferred | loader |
| Leaf | 1.21.3-e380e4b5 | Not build based | inferred | loader |
| Leaves | #91 | Not build based | inferred | loader |
| Pluto | #5 | Not build based | inferred | loader |
| Minecraft Forge | 53.1.0 | Not build based | declared | loader |
| Fabric Loader | 0.19.3 | Not build based | declared | loader |
| Quilt Loader | 0.30.1-beta.2 | Not build based | declared | loader |
| NeoForge | 21.3.97 | 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 1.21.3
What Java version does Minecraft 1.21.3 require?
Minecraft 1.21.3 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 1.21.3 use?
Minecraft 1.21.3 speaks protocol 768, which it shares with 1.21.2. Clients and servers on the same protocol can connect to each other.
Where do I download the Minecraft 1.21.3 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.
Which server software supports Minecraft 1.21.3?
ASPaper, Canvas, DivineMC, Leaf, Leaves, LooHP Limbo, Paper, Pluto, Pufferfish, Purpur, Spigot, Sponge publish builds for 1.21.3. Each one is listed with its build number and checksum.
Go deeper
Metadata from Mojang’s official version manifest. Protocol and data versions from the PrismarineJS minecraft-data project.