Can´t install dependencys

[Classsic]

I'm trying to install this on docker using tensorflow/tensorflow:latest-gpu as base image.
When try to install the requirements I get this error:
root@6e337105a284:~/BlurryFaces# pip install -r requirements.txt Collecting numpy==1.19.4 Using cached numpy-1.19.4-cp36-cp36m-manylinux2010_x86_64.whl (14.5 MB) Collecting tensorflow==2.3.1 Using cached tensorflow-2.3.1-cp36-cp36m-manylinux2010_x86_64.whl (320.4 MB) ERROR: Could not find a version that satisfies the requirement opencv==4.5.0 (from versions: none) ERROR: No matching distribution found for opencv==4.5.0
I´m not familiar with ai frameworks, but as far I can see, the package common used is opencv-python.

Please letme know if you need more info.
Thanks.