Requirements for opencv not found: ['opencv-python-headless==']

I am trying to integrate opencv into my setup but i get this error while checking the config before restarting.
I am using raspbian and HA is installed in a venv. While I am installing opencv, It doesnt get the latest version required by HA. I have updated my distribution to the latest.

pip install opencv-python-headless
Defaulting to user installation because normal site-packages is not writeable
Looking in indexes:,
Requirement already satisfied: opencv-python-headless in ./.local/lib/python3.7/site-packages (
Requirement already satisfied: numpy>=1.16.2 in ./.local/lib/python3.7/site-packages (from opencv-python-headless) (1.18.4)

I have also updgraded pip to the latest version.

Requirement already up-to-date: pip in ./.local/lib/python3.7/site-packages (20.1)

Is there anything else, I should do?

It looks like piwheels has not built a version for the arm yet. So, I guess I will have to wait until they do.