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2021-10-14 - OpenSSH 8.8 dropped support for old ssh-rsa keys using SHA-1

The recent OpenSSH update disabled support for old ssh-rsa keys using SHA-1 by default. See "Potentially-incompatible changes" for details and possible workarounds.

2021-07-04 - Some Mirror/Server/Repository Changes

Primary Pacman Server: We've switched the main server in the pacman config to This server will redirect pacman to an up-to-date mirror near you for each file. We hope this will improve the download speed for users further away from Europe. We also have a new overview of all mirrors here.

Repo Path Renaming: We've renamed mingw/i686/ to mingw/mingw32/ and mingw/x86_86/ to mingw/mingw64/ and added symlinks for the old paths. This means 100GB of resyncing for mirrors using rsync (sorry :/). Having the repo name in the directory path allows us to have one mirrorlist configuration for all repos in the future.

Sourceforge: Due to space constraints we no longer host the source packages on Sourceforge. They are still available on our main server and on all mirrors.

2021-04-21 - R.I.P. mingwandroid

Ray Donnelly is a co-founder and developer of MSYS2 and after a multi year fight with cancer passed away on 2021-04-20.


If you want to know more about his life and work see his fundraiser descriptions:

He was always helpful, knowledgeable, and friendly, and he will be greatly missed.

2021-03-25 - Temporarily broken msys2-launcher package

The repo contained a broken msys2-launcher package for a few hours today causing things like "msys2.exe" to just show an error dialog. You can get back to a working setup this way:

  • Start C:/msys64/msys2_shell.cmd to get a shell
  • Run pacman -Suy to get all the fixed packages

2021-02-27 - New server for and

We have moved (and to a new server. There was a short downtime, but everything should be running great now. Big thanks to for sponsoring the new server.

New mirrorlists for Pacman will be published soon. After you get them, your package installs and updates should be faster than before and without the 404s and glitches.

With the migration, Christoph (@lazka) will now be updating and signing the Pacman databases more often. This should go smoothly as the GPG keys are already in place and the process has been tested on the new server before it went live.

By the way, the redirect domain (no www.) should work more reliably now and HTTPS is now available for it.

2021-01-31 - ASLR enabled by default

About 5 months ago we started backporting patches to our binutils 2.35 to allow enabling ASLR support via various flags. We also enabled these flags in our build system, so any package in our repo that was updated in the last 5 months has ASLR support enabled.

We've now updated to 2.36 which has ASLR enabled by default. Ideally you shouldn't notice any changes, but in case this leads to problems all of it can be disabled/reverted via linker flags:

  • mingw64: -Wl,--disable-dynamicbase,--disable-high-entropy-va,--default-image-base-low
  • mingw32: -Wl,--disable-dynamicbase

Note that this is only a temporary workaround and some of these flags will not be available forever, so you should either fix your code or file a bug in case you suspect a toolchain issue.

Thanks to the binutils developers for improving/fixing ASLR support and to everyone helping on the MSYS2 side of things, especially Jeremy Drake for backporting, upstreaming and fixing bugs exposed by these changes.

Known issues:

2020-12-26 - Zstd exemption for core packages removed

Given it's been months since we began the switch to Zstd for compressing packages, we've now started using it for core packages as well. This means older installations without Zstd support won't be able to cleanly upgrade anymore.

@dmn-star compiled these commands that should update an older installation to support Zstd and unblock futher upgrades:

pacman --noconfirm -U ""
pacman --noconfirm -U ""
pacman --noconfirm -U ""

2020-10-08 - main repo pruned

Due to limited space on the new server and SourceForge file hosting, we are starting to remove older unused packages from the archives. There should still be a 1 year's worth of packages available for downgrades. Mirrors are free to choose whether they want to keep everything or follow the lead.

2020-10-07 - server downtime

From Friday 2nd to Wednesday 10th, the main hosting at was down. The server unfortunately completely died and the hosting had to be moved elsewhere. We thank Diablo-D3 for having provided the hardware and hosting. If you notice anything wrong with since the move, please tell us.

2020-06-29 - new packagers

Alexey is stepping down from his role as the main packager and two new packagers have been appointed in his place:

You can see the keys in full without relying on keyservers in the msys2-keyring GitHub repository.

We have released a new msys2-keyring package from that source (and a new installer that includes them) and we are waiting for a bit before uploading new databases and packages to give people time to update. If you don't update the keyring in time, you'll see something like this:

:: Synchronizing package databases...
downloading mingw32.db...
downloading mingw32.db.sig...
error: mingw32: key "4A6129F4E4B84AE46ED7F635628F528CF3053E04" is unknown
:: Import PGP key 4096R/87771331B3F1FF5263856A6D974C8BE49078F532, "David Macek <>", created: 2018-01-14? [Y/n]
error: mingw32: signature from "David Macek <>" is marginal trust
error: failed to update mingw32 (invalid or corrupted database (PGP signature))

downloading mingw64.db...
downloading mingw64.db.sig...
error: mingw64: signature from "David Macek <>" is marginal trust
error: failed to update mingw64 (invalid or corrupted database (PGP signature))

downloading msys.db...
downloading msys.db.sig...
error: msys: signature from "David Macek <>" is marginal trust
error: failed to update msys (invalid or corrupted database (PGP signature))
error: failed to synchronize all databases

error: mingw32: signature from "David Macek <>" is marginal trust
error: mingw64: signature from "David Macek <>" is marginal trust
error: msys: signature from "David Macek <>" is marginal trust

We have prepared the following steps to verify and install the new keyring manually after which you should be able to use pacman -Syu again:

$ curl -O
$ curl -O

$ pacman-key --verify msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz.sig
==> Checking msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz.sig... (detached)
gpg: Signature made Mon Jun 29 07:36:14 2020 CEST
gpg:                using DSA key AD351C50AE085775EB59333B5F92EFC1A47D45A1
gpg: Good signature from "Alexey Pavlov (Alexpux) <>" [full]

# pacman -U msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz

If you can't even import the key and the above command fails like this:

error: msys: key "4A6129F4E4B84AE46ED7F635628F528CF3053E04" is unknown
:: Import PGP key 4A6129F4E4B84AE46ED7F635628F528CF3053E04? [Y/n]
error: database 'msys' is not valid (invalid or corrupted database (PGP signature))
loading packages...
error: failed to prepare transaction (invalid or corrupted database)

... you have to convince pacman to not care about those databases for a while, for example like this:

# pacman -U --config <(echo) msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz

If you still see signature errors, resetting your pacman key store might help:

# rm -r /etc/pacman.d/gnupg/
# pacman-key --init
# pacman-key --populate msys2

2020-06-15 - New base metapackage; pacman-contrib is now separate

Following a similar change in Arch Linux, the base group was replaced with a base metapackage. If you installed your MSYS2 using an installer older than 2020-06-02, please run pacman -S base to get up to date.

This also installs the pacman-contrib package where updpkgsums, pactree etc. now live (previously included in the pacman package).

Details at #1979, #1976 and #1988.

2020-05-31 - Update may fail with "could not open file"

In case your update process errors out with something similar to

error: could not open file /var/cache/pacman/pkg/zstd-1.4.5-1-x86_64.pkg.tar.zst: Child process exited with status 127

update pacman separately first:

pacman -Sydd pacman

This issue is caused by a pacman version that is too old and can't handle newer packages compressed with zstd. In case you are seeing this problem in CI consider using a newer base which contains a newer pacman which supports zstd:

2020-05-22 - MSYS2 may fail to start after a msys2-runtime upgrade

MSYS2 programs will fail to start if programs started before the update are still running in the background (especially sshd, dirmngr, gpg-agent, bash, pacman and mintty). You can stop them by running the following in a Windows terminal:

taskkill /f /fi "MODULES eq msys-2.0.dll"

If that fails, try a reboot.

We've improved our update process so this shouldn't happen again with future updates.

2020-05-22 - Pacman may fail to install packages with Unrecognized archive format

For a while, the core packages were prematurely packaged using zstd without giving users time to update to zstd-enabled pacman first. This should be resolved now.

2020-05-17 - 32-bit MSYS2 no longer actively supported

32-bit mingw-w64 packages are still supported, this is about the POSIX emulation layer, i.e. the runtime, Bash, MinTTY...

After this date, we don't plan on building updated msys-i686 packages nor releasing i686 installers anymore. This is due to increasingly frustrating difficulties with limited 32-bit address space, high penetration of 64-bit systems and Cygwin (our upstream) starting their way to drop 32-bit support as well.

2019-06-03 - mingw-w64 Ada and ObjC unsupported until further notice

Pacman may say this when updating:

looking for conflicting packages...
error: failed to prepare transaction (could not satisfy dependencies)
:: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-x86_64-gcc=8.3.0-2' required by mingw-w64-x86_64-gcc-ada
:: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-x86_64-gcc=8.3.0-2' required by mingw-w64-x86_64-gcc-objc
:: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-i686-gcc=8.3.0-2' required by mingw-w64-i686-gcc-ada
:: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-i686-gcc=8.3.0-2' required by mingw-w64-i686-gcc-objc

Ada and ObjC are currently unsupported in MSYS2 builds due to long-standing issues with the i686 variant. Run pacman -R mingw-w64-x86_64-gcc-ada mingw-w64-x86_64-gcc-objc and/or pacman -R mingw-w64-i686-gcc-ada mingw-w64-i686-gcc-objc, then update.

2016 - Core update integrated into Pacman; update-core removed

The function of update-core is transferred to pacman -Syuu.

2016 - Command window may linger after startup

Change the argument /K to /C in all three Start menu shortcuts.