> ## Documentation Index
> Fetch the complete documentation index at: https://docs.domino.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Add packages to Environments

Add packages to your Environment and manage package versions.

[Package dependency files](/cloud/platform-capabilities/core-concepts/compute-environments/add-packages-to-environments/package-dependency-files)\
Use `requirements.txt` or `install.R` to install packages to your Environment every time you start an execution.

[Internal package hosting](/cloud/platform-capabilities/core-concepts/compute-environments/add-packages-to-environments/set-up-internal-package-hosting)\
Use Dockerfile instructions to install internal mirrors of public package repositories.

[Preload Environment packages](/cloud/platform-capabilities/core-concepts/compute-environments/add-packages-to-environments/preload-environment-packages)\
Use Dockerfile instructions to install packages to your Environment permanently with quick execution times.

[Use requirements.txt](/cloud/platform-capabilities/core-concepts/compute-environments/add-packages-to-environments/use-requirements-txt)\
Specify additional dependencies, you can add a pip requirements file named `requirements.txt` to the root of your project folder. (This is for Python only.)