How to Update a Medieval MC Server | Safer 2026 Guide
Medieval MC ships as numbered generations — MMC3 on Minecraft 1.19.2, MMC4 on 1.20.1 — and the first thing to get right about updating it is knowing which kind of update you're actually doing.
New to hosting it? The Medieval MC hosting guide covers RAM and first-boot basics. See also the Medieval MC pack page.
1. Know whether this is a generation jump or a point release
MMC3 to MMC4 is a jump across Minecraft versions (1.19.2 to 1.20.1) with a substantially different mod list — effectively a new pack, the same way ATM9 to ATM10 is. There's no safe in-place update path across that line; treat it as a fresh server with a new world.
A point release within the current generation (say v40 to v41 on MMC4) is a routine update, and the rest of this guide covers that case.
2. Back up before any update
Quest progress, boss defeats and village-style RPG state live in the world save. Take a full restore point before updating, even for a minor point release.
3. Get the matching Forge server pack
- Download the server pack for your exact target version from CurseForge or Modrinth — not the client pack.
- Shut the server down with the stop command before swapping files.
- Install into a clean mods folder rather than layering the new version over the old one.
4. Verify quest and RPG content on first boot
Wait for a clean Done on startup, then check that a quest giver or known boss area loads correctly before reopening to players — that's the content most likely to reveal a subtle version mismatch the startup log alone won't show.
FAQ
Can I update from Medieval MC MMC3 to MMC4 in place?+
No — MMC3 (Minecraft 1.19.2) and MMC4 (Minecraft 1.20.1) are different Minecraft versions with a large mod-list change, not a patch release. Treat moving between generations as a fresh server with a new world, the same way you'd treat ATM9 to ATM10.
Is it safe to update within the same MMC4 release line?+
Yes — a point release within the same generation (v40 to v41, for example) is a routine update: backup, get the matching server pack, verify the first boot. That's the update this guide covers.
What should I check after updating?+
A normal clean boot to Done, plus a quest giver or boss area you know should load correctly — Medieval MC's RPG quest and boss content is the kind of thing a version mismatch breaks first.
Update Medieval MC without guessing which kind of update it is
CoalHost keeps automatic backups ahead of every update and runs the right Forge build for the current Medieval MC generation.
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