$ poetry add gino[starlette]
Using version ^1.0.1 for gino
Updating dependencies
Resolving dependencies... (0.1s)
Writing lock file
Package operations: 8 installs, 0 updates, 0 removals
 • Installing idna (3.3)
 • Installing sniffio (1.2.0)
 • Installing anyio (3.5.0)
 • Installing gino (1.0.1)
 • Installing starlette (0.16.0)
 • Installing asyncpg (0.25.0)
 • Installing gino-starlette (0.1.3)
 • Installing sqlalchemy (1.3.24)
$ poetry add fastapi uvicorn gunicorn
Using version ^0.73.0 for fastapi
Using version ^0.17.4 for uvicorn
Using version ^20.1.0 for gunicorn
Updating dependencies
Resolving dependencies... (0.1s)
 SolverProblemError
 Because no versions of gino-starlette match >0.1.1,<0.1.2 || >0.1.2,<0.1.3 || >0.1.3,<0.2.0
 and gino-starlette (0.1.1) depends on starlette (>=0.13.0,<0.14.0), gino-starlette (>=0.1.1,<0.1.2 || >0.1.2,<0.1.3 || >0.1.3,<0.2.0) requires starlette (>=0.13.0,<0.14.0).
 And because gino-starlette (0.1.2) depends on starlette (>=0.13.0,<0.15.0)
 and gino-starlette (0.1.3) depends on starlette (>=0.16,<0.17), gino-starlette (>=0.1.1,<0.2.0) requires starlette (>=0.13.0,<0.15.0 || >=0.16,<0.17).
 Because no versions of fastapi match >0.73.0,<0.74.0
 and fastapi (0.73.0) depends on starlette (0.17.1), fastapi (>=0.73.0,<0.74.0) requires starlette (0.17.1).
 Thus, fastapi (>=0.73.0,<0.74.0) is incompatible with gino-starlette (>=0.1.1,<0.2.0).
 And because gino (1.0.1) depends on gino-starlette (>=0.1.1,<0.2.0)
 and no versions of gino match >1.0.1,<2.0.0, fastapi (>=0.73.0,<0.74.0) is incompatible with gino (>=1.0.1,<2.0.0).
 So, because gino-fastapi-demo depends on both gino (^1.0.1) and fastapi (^0.73.0), version solving failed.
 at ~/.poetry/lib/poetry/puzzle/solver.py:241 in _solve
 237│ packages = result.packages
 238│ except OverrideNeeded as e:
 239│ return self.solve_in_compatibility_mode(e.overrides, use_latest=use_latest)
 240│ except SolveFailure as e:
 → 241│ raise SolverProblemError(e)
 242│ 
 243│ results = dict(
 244│ depth_first_search(
 245│ PackageNode(self._package, packages), aggregate_package_nodes