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Update Conda Environments Using a YAML File Once you have created a conda environment, you can update it anytime by first activating the environment and then running the conda env update command.
You can install a conda package also without activating the environment. Just use conda install -n <env_name> <package> or conda install -p <path/to/env> <package> . Show activity on this post. If you want to install a specific package inside a specific conda environment, you can use the following command.
environment.yml files have a specific syntax (e.g. for env name, source channels, packages) e.g. conda env create --file environment.yml. some flags available with conda create are not available with conda env create , such as --strict-channel-priority , which may result in some confusion.
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.
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!
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