Why does "pipenv install" install a different version than what's in the Pipfile?

Question

Pipfile:

[packages]
xgboost = "1.4.2"

I've also tried xgboost = "1.4" using the command pipenv install for a new pipenv environment.

When I check the installed version using pipenv run pip freeze :

numpy==1.22.0
scipy==1.7.3
xgboost==1.5.1

Why can't I install xgboost 1.4.2 ?

I can work around it by downloading the wheel file or using the url to install 1.4.2:

xgboost = {path = "./xgboost-1.4.2-py3-none-win_amd64.whl"}
xgboost = {file = "https://files.pythonhosted.org/packages/d4/60/845dd265c7265d3bd44906d1c15be2908ff0655b32d9000935aeaeef6677/xgboost-1.4.2-py3-none-win_amd64.whl"}

Answer 1

I found the problem. I should code:

[packages]
xgboost = "==1.4.2"