Frustratingly, they're not by default though; you need to explicitly use `--locked` (or `--frozen`, which is an alias for `--locked --offline`) to avoid implicit updates. I've seen multiple teams not realize this and get confused about CI failures from it.
The implicit update surface is somewhat limited by the fact that versions in Cargo.toml implicitly assume the `^` operator on versions that don't specify a different operator, so "1.2.3" means "1.2.x, where x >= 3". For reasons that have never been clear to me, people also seem to really like not putting the patch version in though and just putting stuff like "1.2", meaning that anything other than a major version bump will get pulled in.
Frustratingly, they're not by default though; you need to explicitly use `--locked` (or `--frozen`, which is an alias for `--locked --offline`) to avoid implicit updates. I've seen multiple teams not realize this and get confused about CI failures from it.
The implicit update surface is somewhat limited by the fact that versions in Cargo.toml implicitly assume the `^` operator on versions that don't specify a different operator, so "1.2.3" means "1.2.x, where x >= 3". For reasons that have never been clear to me, people also seem to really like not putting the patch version in though and just putting stuff like "1.2", meaning that anything other than a major version bump will get pulled in.