docker: No valid trust data for 3.9.5-slim

I am updating a docker-container and I realized that the python version is still 3.9.0.

The issue:

$ export DOCKER_CONTENT_TRUST=1
$ docker run -it --rm --name container_name python:3.9.5-slim bash
docker: No valid trust data for 3.9.5-slim.

The trap:

$ export DOCKER_CONTENT_TRUST=1
$ docker run -it --rm --name container_name python:3.9-slim bash  # 3.9-slim NOT 3.9.5-slim
# echo $PYTHON_VERSION
3.9.0