Unable to add spatie/laravel-sluggable package in laravel 5.4.36

I am new to Laravel, I tried to add spatie/laravel-sluggable in my setup but faced this error in the terminal. I tried to search this but didn't find any relevant solution.

Any help will be appreciated.

here is the error:

Problem 1
    - Conclusion: remove laravel/framework v5.4.36
    - Conclusion: don't install laravel/framework v5.4.36
    - spatie/laravel-sluggable 2.1.0 requires illuminate/database ~5.5.0 -> satisfiable by illuminate/database[v5.5.0, v5.5.16, v5.5.17, v5.5.2, v5.5.28, v5.5.33,
v5.5.34, v5.5.35, v5.5.36, v5.5.37, v5.5.39, v5.5.40, v5.5.41, v5.5.43, v5.5.44].
    - spatie/laravel-sluggable 2.1.5 requires illuminate/database ~5.5.0|~5.6.0|~5.7.0 -> satisfiable by illuminate/database[5.7.17, 5.7.18, 5.7.19, v5.5.0, v5.5.1
6, v5.5.17, v5.5.2, v5.5.28, v5.5.33, v5.5.34, v5.5.35, v5.5.36, v5.5.37, v5.5.39, v5.5.40, v5.5.41, v5.5.43, v5.5.44, v5.6.0, v5.6.1, v5.6.10, v5.6.11, v5.6.12, v
5.6.13, v5.6.14, v5.6.15, v5.6.16, v5.6.17, v5.6.19, v5.6.2, v5.6.20, v5.6.21, v5.6.22, v5.6.23, v5.6.24, v5.6.25, v5.6.26, v5.6.27, v5.6.28, v5.6.29, v5.6.3, v5.6
.30, v5.6.31, v5.6.32, v5.6.33, v5.6.34, v5.6.35, v5.6.36, v5.6.37, v5.6.38, v5.6.39, v5.6.4, v5.6.5, v5.6.6, v5.6.7, v5.6.8, v5.6.9, v5.7.0, v5.7.1, v5.7.10, v5.7
.11, v5.7.15, v5.7.2, v5.7.20, v5.7.21, v5.7.22, v5.7.23, v5.7.26, v5.7.27, v5.7.3, v5.7.4, v5.7.5, v5.7.6, v5.7.7, v5.7.8, v5.7.9].
    - spatie/laravel-sluggable 2.1.6 requires illuminate/database ~5.5.0|~5.6.0|~5.7.0 -> satisfiable by illuminate/database[5.7.17, 5.7.18, 5.7.19, v5.5.0, v5.5.1
6, v5.5.17, v5.5.2, v5.5.28, v5.5.33, v5.5.34, v5.5.35, v5.5.36, v5.5.37, v5.5.39, v5.5.40, v5.5.41, v5.5.43, v5.5.44, v5.6.0, v5.6.1, v5.6.10, v5.6.11, v5.6.12,
    - don't install illuminate/database v5.5.0|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.16|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.17|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.2|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.28|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.33|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.34|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.35|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.36|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.37|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.39|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.40|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.41|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.43|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.5.44|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.6.0|don't install laravel/framework v5.4.36
    - don't install illuminate/database v5.6.1|don't install laravel/framework v5.4.36
    - Installation request for laravel/framework (locked at v5.4.36, required as 5.4.*) -> satisfiable by laravel/framework[v5.4.36].
    - Installation request for spatie/laravel-sluggable ^2.1 -> satisfiable by spatie/laravel-sluggable[2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6].


Installation failed, reverting ./composer.json to its original content.

I also tried to add illuminate/database but it also showed the same issue.

via Chebli Mohamed