Researchers recently announced SHAttered, the first collision of the SHA-1 hash function, prompting GitHub to implement measures to detect and reject any Git content involved in collision attacks. This action ensures that GitHub cannot be used to perpetrate such attacks, as Git relies on SHA-1 hashes to name and link data objects, making collisions a potential security risk if they were to occur. While accidental collisions are extremely unlikely, a deliberate collision attack could allow a malicious actor to create a pair of similar objects that appear identical to a signer but differ in content. GitHub's new detection code, developed by Marc Stevens and Dan Shumow, identifies patterns left by collision-generating techniques, thwarting attempts to exploit the SHA-1 algorithm's weaknesses. Although no Git collisions have been observed yet, GitHub is collaborating with the Git project to integrate collision detection into future releases and plans to transition to a more secure hash algorithm to further safeguard against these vulnerabilities.