unable to install on laravel 5.8

[Efrat19]

seems like its not compatible with laravel 5.8
when trying: composer require webklex/laravel-pdfmerger
i get:

Using version ^1.1 for webklex/laravel-pdfmerger
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for webklex/laravel-pdfmerger ^1.1 -> satisfiable by webklex/laravel-pdfmerger[1.1.0].
    - Installation request for setasign/fpdi (locked at v2.2.0) -> satisfiable by setasign/fpdi[v2.2.0].
    - Can only install one of: setasign/fpdi-fpdf[v2.2.0, 1.6.0].
    - Can only install one of: setasign/fpdi-fpdf[1.6.0, v2.2.0].
    - Can only install one of: setasign/fpdi-fpdf[1.6.0, v2.2.0].
    - Conclusion: install setasign/fpdi-fpdf 1.6.0
    - Installation request for setasign/fpdi-fpdf (locked at v2.2.0) -> satisfiable by setasign/fpdi-fpdf[v2.2.0].


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

my relevant part of composer.json:

"require": {
        "php": "^7.1.3",
        "fideloper/proxy": "^4.0",
        "laravel/framework": "5.8.*",
        "laravel/telescope": "^2.0",
        "laravel/tinker": "^1.0",
        "tymon/jwt-auth": "^1.0"
    },