Stability Constraints# If you are using a constraint that does not explicitly define a stability, Composer will default internally to -dev or -stable, depending on the operator(s) used. This happens transparently. If you wish to explicitly consider only the stable release in the comparison, add the suffix -stable.

Constraint	Internally
1.2.3	=1.2.3.0-stable
>1.2	>1.2.0.0-stable
>=1.2	>=1.2.0.0-dev
>=1.2-stable	>=1.2.0.0-stable
<1.3	<1.3.0.0-dev
<=1.3	<=1.3.0.0-stable
1 - 2	>=1.0.0.0-dev <3.0.0.0-dev
~1.3	>=1.3.0.0-dev <2.0.0.0-dev
1.4.*	>=1.4.0.0-dev <1.5.0.0-dev

Summary# "require": { "vendor/package": "1.3.2", // exactly 1.3.2 // >, <, >=, <= | specify upper / lower bounds "vendor/package": ">=1.3.2", // anything above or equal to 1.3.2 "vendor/package": "<1.3.2", // anything below 1.3.2 // * | wildcard "vendor/package": "1.3.*", // >=1.3.0 <1.4.0 // ~ | allows last digit specified to go up "vendor/package": "~1.3.2", // >=1.3.2 <1.4.0 "vendor/package": "~1.3", // >=1.3.0 <2.0.0 // ^ | doesn't allow breaking changes (major version fixed - following semver) "vendor/package": "^1.3.2", // >=1.3.2 <2.0.0 "vendor/package": "^0.3.2", // >=0.3.2 <0.4.0 // except if major version is 0 }