Installation issue with Laravel/Lumen 5.6

[niczak]

I am attempting to install the latest version of this library (composer require alchemy/ghostscript) and I get the following error:

    - symfony/console v4.0.4 conflicts with symfony/process[v3.2.4].
    - symfony/console v4.0.4 conflicts with symfony/process[v3.2.5].
    - symfony/console v4.0.4 conflicts with symfony/process[v3.2.6].
    - symfony/console v4.0.4 conflicts with symfony/process[v3.2.7].
    - symfony/console v4.0.4 conflicts with symfony/process[v3.2.8].
    - symfony/console v4.0.4 conflicts with symfony/process[v3.2.9].
    - Installation request for symfony/console (installed at v4.0.4) -> satisfiable by symfony/console[v4.0.4].
    - alchemy/binary-driver 1.6.0 requires symfony/process ^2.0|^3.0 -> satisfiable by ?symfony/process[2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.x-dev, 2.1.x-dev, 2.2.x-dev, 2.3.x-dev, 2.4.x-dev, 2.5.x-dev, 2.6.x-dev, 2.7.x-dev, 2.8.x-dev, 3.0.x-dev,3.1.x-dev, 3.2.x-dev, 3.3.x-dev, 3.4.x-dev, v2.0.10, v2.0.12, v2.0.13, v2.0.14,v2.0.15, v2.0.16, v2.0.17, v2.0.18, v2.0.19, v2.0.20, v2.0.21, v2.0.22, v2.0.23
, v2.0.24, v2.0.25, v2.0.9, v2.1.0, v2.1.1, v2.1.10, v2.1.11, v2.1.12, v2.1.13,
v2.1.2, v2.1.3, v2.1.4, v2.1.5, v2.1.6, v2.1.7, v2.1.8, v2.1.9, v2.2.0, v2.2.1,
v2.2.10, v2.2.11, v2.2.2, v2.2.3, v2.2.4, v2.2.5, v2.2.6, v2.2.7, v2.2.8, v2.2.9
, v2.3.0, v2.3.1, v2.3.10, v2.3.11, v2.3.12, v2.3.13, v2.3.14, v2.3.15, v2.3.16,
 v2.3.17, v2.3.18, v2.3.19, v2.3.2, v2.3.20, v2.3.21, v2.3.22, v2.3.23, v2.3.24,
 v2.3.25, v2.3.26, v2.3.27, v2.3.28, v2.3.29, v2.3.3, v2.3.30, v2.3.31, v2.3.32,
 v2.3.33, v2.3.34, v2.3.35, v2.3.36, v2.3.37, v2.3.38, v2.3.39, v2.3.4, v2.3.40,
 v2.3.41, v2.3.42, v2.3.5, v2.3.6, v2.3.7, v2.3.8, v2.3.9, v2.4.0, v2.4.0-BETA1,
 v2.4.0-BETA2, v2.4.0-RC1, v2.4.1, v2.4.10, v2.4.2, v2.4.3, v2.4.4, v2.4.5, v2.4
.6, v2.4.7, v2.4.8, v2.4.9, v2.5.0, v2.5.0-BETA1, v2.5.0-BETA2, v2.5.0-RC1, v2.5
.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v
2.5.8, v2.5.9, v2.6.0, v2.6.0-BETA1, v2.6.0-BETA2, v2.6.1, v2.6.10, v2.6.11, v2.
6.12, v2.6.13, v2.6.2, v2.6.3, v2.6.4, v2.6.5, v2.6.6, v2.6.7, v2.6.8, v2.6.9, v
2.7.0, v2.7.0-BETA1, v2.7.0-BETA2, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v
2.7.14, v2.7.15, v2.7.16, v2.7.17, v2.7.18, v2.7.19, v2.7.2, v2.7.20, v2.7.21, v
2.7.22, v2.7.23, v2.7.24, v2.7.25, v2.7.26, v2.7.27, v2.7.28, v2.7.29, v2.7.3, v
2.7.30, v2.7.31, v2.7.32, v2.7.33, v2.7.34, v2.7.35, v2.7.36, v2.7.37, v2.7.38,
v2.7.39, v2.7.4, v2.7.40, v2.7.41, v2.7.42, v2.7.43, v2.7.5, v2.7.6, v2.7.7, v2.
7.8, v2.7.9, v2.8.0, v2.8.0-BETA1, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v
2.8.14, v2.8.15, v2.8.16, v2.8.17, v2.8.18, v2.8.19, v2.8.2, v2.8.20, v2.8.21, v
2.8.22, v2.8.23, v2.8.24, v2.8.25, v2.8.26, v2.8.27, v2.8.28, v2.8.29, v2.8.3, v
2.8.30, v2.8.31, v2.8.32, v2.8.33, v2.8.34, v2.8.35, v2.8.36, v2.8.4, v2.8.5, v2
.8.6, v2.8.7, v2.8.8, v2.8.9, v3.0.0, v3.0.0-BETA1, v3.0.1, v3.0.2, v3.0.3, v3.0
.4, v3.0.5, v3.0.6, v3.0.7, v3.0.8, v3.0.9, v3.1.0, v3.1.0-BETA1, v3.1.0-RC1, v3
.1.1, v3.1.10, v3.1.2, v3.1.3, v3.1.4, v3.1.5, v3.1.6, v3.1.7, v3.1.8, v3.1.9, v
3.2.0, v3.2.0-BETA1, v3.2.0-RC1, v3.2.0-RC2, v3.2.1, v3.2.10, v3.2.11, v3.2.12,
v3.2.13, v3.2.14, v3.2.2, v3.2.3, v3.2.4, v3.2.5, v3.2.6, v3.2.7, v3.2.8, v3.2.9
, v3.3.0, v3.3.0-BETA1, v3.3.0-RC1, v3.3.1, v3.3.10, v3.3.11, v3.3.12, v3.3.13,
v3.3.14, v3.3.15, v3.3.16, v3.3.2, v3.3.3, v3.3.4, v3.3.5, v3.3.6, v3.3.7, v3.3.
8, v3.3.9, v3.4.0, v3.4.0-BETA1, v3.4.0-BETA2, v3.4.0-BETA3, v3.4.0-BETA4, v3.4.
0-RC1, v3.4.0-RC2, v3.4.1, v3.4.2, v3.4.3, v3.4.4, v3.4.5, v3.4.6].
    - Can only install one of: symfony/process[v4.0.4, 3.3.x-dev].
    - Can only install one of: symfony/process[v4.0.4, 3.4.x-dev].
    - Can only install one of: symfony/process[v4.0.4, v3.3.0].
    - Can only install one of: symfony/process[v4.0.4, v3.3.0-BETA1].
    - Can only install one of: symfony/process[v4.0.4, v3.3.0-RC1].
    - Can only install one of: symfony/process[v4.0.4, v3.3.1].
    - Can only install one of: symfony/process[v4.0.4, v3.3.10].
    - Can only install one of: symfony/process[v4.0.4, v3.3.11].
    - Can only install one of: symfony/process[v4.0.4, v3.3.12].
    - Can only install one of: symfony/process[v4.0.4, v3.3.13].
    - Can only install one of: symfony/process[v4.0.4, v3.3.14].
    - Can only install one of: symfony/process[v4.0.4, v3.3.15].
    - Can only install one of: symfony/process[v4.0.4, v3.3.16].
    - Can only install one of: symfony/process[v4.0.4, v3.3.2].
    - Can only install one of: symfony/process[v4.0.4, v3.3.3].
    - Can only install one of: symfony/process[v4.0.4, v3.3.4].
    - Can only install one of: symfony/process[v4.0.4, v3.3.5].
    - Can only install one of: symfony/process[v4.0.4, v3.3.6].
    - Can only install one of: symfony/process[v4.0.4, v3.3.7].
    - Can only install one of: symfony/process[v4.0.4, v3.3.8].
    - Can only install one of: symfony/process[v4.0.4, v3.3.9].
    - Can only install one of: symfony/process[v4.0.4, v3.4.0].
    - Can only install one of: symfony/process[v4.0.4, v3.4.0-BETA1].
    - Can only install one of: symfony/process[v4.0.4, v3.4.0-BETA2].
    - Can only install one of: symfony/process[v4.0.4, v3.4.0-BETA3].
    - Can only install one of: symfony/process[v4.0.4, v3.4.0-BETA4].
    - Can only install one of: symfony/process[v4.0.4, v3.4.0-RC1].
    - Can only install one of: symfony/process[v4.0.4, v3.4.0-RC2].
    - Can only install one of: symfony/process[v4.0.4, v3.4.1].
    - Can only install one of: symfony/process[v4.0.4, v3.4.2].
    - Can only install one of: symfony/process[v4.0.4, v3.4.3].
    - Can only install one of: symfony/process[v4.0.4, v3.4.4].
    - Can only install one of: symfony/process[v4.0.4, v3.4.5].
    - Can only install one of: symfony/process[v4.0.4, v3.4.6].
    - Installation request for symfony/process (installed at v4.0.4) -> satisfiable by symfony/process[v4.0.4].

I have tried removing my composer lock file but no luck. Any ideas?

[chugunomi]

Same issue with alchemy/binary-driver while requiring on PHP-FFMpeg on Lumen 5.6