...
"require": {
"vendor/package": "1.3.2", // exactly 1.3.2 (exact)
// >, <, >=, <= | 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