PNG  IHDR;IDATxܻn0K )(pA 7LeG{ §㻢|ذaÆ 6lذaÆ 6lذaÆ 6lom$^yذag5bÆ 6lذaÆ 6lذa{ 6lذaÆ `}HFkm,mӪôô! x|'ܢ˟;E:9&ᶒ}{v]n&6 h_tڠ͵-ҫZ;Z$.Pkž)!o>}leQfJTu іچ\X=8Rن4`Vwl>nG^is"ms$ui?wbs[m6K4O.4%/bC%t Mז -lG6mrz2s%9s@-k9=)kB5\+͂Zsٲ Rn~GRC wIcIn7jJhۛNCS|j08yiHKֶۛkɈ+;SzL/F*\Ԕ#"5m2[S=gnaPeғL lذaÆ 6l^ḵaÆ 6lذaÆ 6lذa; _ذaÆ 6lذaÆ 6lذaÆ RIENDB` # Why are unbound version constraints a bad idea? A version constraint without an upper bound such as `*`, `>=3.4` or `dev-master` will allow updates to any future version of the dependency. This includes major versions breaking backward compatibility. Once a release of your package is tagged, you cannot tweak its dependencies anymore in case a dependency breaks BC - you have to do a new release, but the previous one stays broken. The only good alternative is to define an upper bound on your constraints, which you can increase in a new release after testing that your package is compatible with the new major version of your dependency. For example instead of using `>=3.4` you should use `~3.4` which allows all versions up to `3.999` but does not include `4.0` and above. The `^` operator works very well with libraries following [semantic versioning](https://semver.org). **Note:** As a package maintainer, you can help your users by providing an [alias version](../articles/aliases.md) for your development branch to allow it to match bound constraints.