Hi Paul,

I noticed, the new xarray package versions (i.e >=2025.0) tends to have conflicts with several dependencies when 'pip' installer when installing HEST. The conflicts are easily resolved with the UV package manager but issues are when using pip. I tried several different changes on 3 clusters. Restricting xarray is the only solution I came up with. Maybe this could be helpful.

pyproject.toml.txt

To reproduce:
Install HEST as is in a conda env now. You get several dependency conflicts

error: resolution-too-deep

× Dependency resolution exceeded maximum depth
╰─> Pip cannot resolve the current dependencies as the dependency graph is too complex for pip to solve efficiently.

hint: Try adding lower bounds to constrain your dependencies, for example: 'package>=2.0.0' instead of just 'package'. 

Solution: Update toml file with "xarray<=2024.11"

Lmk if this works for you and should be updated.