How to update an existing Conda environment with a .yml file
The suggested answer is partially correct. You'll need to add the --prune option to also uninstall packages that were removed from the environment.yml. Correct command:
conda env update -f local.yml --prune
alkamid's answer is on the right lines, but I have found that Conda fails to install new dependencies if the environment is already active. Deactivating the environment first resolves this:
source deactivate;
conda env update -f whatever.yml;
source activate my_environment_name; # Must be AFTER the conda env update line!
Try using conda env update:
conda activate myenv
conda env update --file local.yml --prune
--prune
uninstalls dependencies which were removed from local.yml
, as pointed out in this answer by @Blink.
Or without the need to activate the environment (thanks @NumesSanguis):
conda env update --name myenv --file local.yml --prune
See Updating an environment in Conda User Guide.