Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires hyperf/engine ^3.1, found hyperf/engine[dev-master, dev-dev, dev-assert6-patch-1, v1.0.0, ..., 1.x-dev, v2.0.0-beta.1, ..., 2.10.x-dev (alias of dev-master)] but it does not match the constraint. Problem 2 - Root composer.json requires hyperf/context ^3.1 -> satisfiable by hyperf/context[v3.1.0-alpha.1, ..., 3.1.x-dev]. - hyperf/context[v3.1.0-alpha.1, ..., 3.1.x-dev] require hyperf/engine ^2.0 -> found hyperf/engine[dev-master, v2.0.0-beta.1, ..., 2.10.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^3.1). Problem 3 - Root composer.json requires hyperf/coordinator ^3.1 -> satisfiable by hyperf/coordinator[v3.1.0-alpha.1, v3.1.0-beta.2, v3.1.0-rc.4, 3.1.x-dev]. - hyperf/coordinator[v3.1.0-alpha.1, ..., 3.1.x-dev] require hyperf/engine ^2.0 -> found hyperf/engine[dev-master, v2.0.0-beta.1, ..., 2.10.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^3.1). Problem 4 - Root composer.json requires hyperf/coroutine ^3.1 -> satisfiable by hyperf/coroutine[v3.1.0-alpha.1, ..., 3.1.x-dev]. - hyperf/coroutine[v3.1.0-alpha.1, ..., 3.1.x-dev] require hyperf/engine ^2.0 -> found hyperf/engine[dev-master, v2.0.0-beta.1, ..., 2.10.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^3.1). Problem 5 - hyperf/utils[v3.1.0-alpha.1, ..., 3.1.x-dev] require hyperf/engine ^2.0 -> found hyperf/engine[dev-master, v2.0.0-beta.1, ..., 2.10.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (^3.1). - hyperf/db-connection[v3.1.0-alpha.1, ..., 3.1.x-dev] require hyperf/utils ~3.1.0 -> satisfiable by hyperf/utils[v3.1.0-alpha.1, v3.1.0-rc.4, 3.1.x-dev]. - Root composer.json requires hyperf/db-connection ^3.1 -> satisfiable by hyperf/db-connection[v3.1.0-alpha.1, v3.1.0-beta.13, v3.1.0-rc.4, 3.1.x-dev].

Process completed with exit code 2.