At some point in March, Adobe released a new version of Shockwave, 12.2.4.194. The release notes are light on details, saying only that the version includes “Deprecation of SHA-1 certificates in the Shockwave installer.”

SHA-1 is no longer considered secure, so this is a security update, and anyone who uses a web browser with Shockwave enabled should install the latest version as soon as possible. Note that the Shockwave plugin sometimes appears in browsers as Shockwave for Director.