GNU MPFR version 4.2.1 (released on 22 August 2023)

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The fondue savoyarde release, patch level 1.

MPFR 4.2.1 requires GMP 5.0 or higher.


The MPFR 4.2.1 source can be downloaded in the following archive formats:

Each tarball is signed by Vincent Lefèvre. This can be verified using the DSA key ID 5831D11A0D4DB02A; this key can be retrieved with:

gpg --recv-keys 5831D11A0D4DB02A

or by downloading it from The key fingerprint is:

A534 BE3F 83E2 41D9 1828  0AEB 5831 D11A 0D4D B02A

The signatures can be verified with:

gpg --verify file.asc

You should check that the key fingerprint matches.

MPFR is also available via third-party packages and ports.



See the BUGS file. The Reporting Bugs section of the MPFR manual gives details on how to report new bugs.

Changes from version 4.2.0 to version 4.2.1

Platforms Known to Support MPFR

MPFR 4.2.1 has been successfully compiled and checked on the following platforms:

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