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# MD5 and SHA-1 Deprecation
During early 2015 Homebrew started the process of deprecating _SHA1_ for package
integrity verification. Since then every formulae under the Homebrew organisation
has been moved onto _SHA256_ verification; this includes both source packages
and our precompiled packages (bottles).
We have stopped supporting _SHA1_ and _MD5_ entirely.
_MD5_ checksums were removed from core formulae in 2012 but until April 2015
if you tried to install a formula still using one Homebrew wouldn't actively stop you.
We removed _SHA1_ support in **November 2016**,
21 months after we started warning people to move away from it for verification.
This is enforced in the same way _MD5_ is, by blocking the installation of that
individual formula until the checksum is migrated.
From March 20th 2016 we've stepped up the visibility of that notification & you'll start
seeing deprecation warnings when installing _SHA1_-validated formula.
If you see these please consider reporting it to where the formula originated.
This means custom taps, local custom formulae, etc need to be migrated to use
_SHA256_ before you can install them.
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