diff --git a/requirements_upstream.txt b/requirements_upstream.txt
index 71145c0ce..c5ebda67e 100644
--- a/requirements_upstream.txt
+++ b/requirements_upstream.txt
@@ -2,4 +2,5 @@ bottleneck @ git+https://github.com/pydata/bottleneck.git@master
 cftime @ git+https://github.com/Unidata/cftime.git@master
 flox @ git+https://github.com/xarray-contrib/flox.git@main
 numba @ git+https://github.com/numba/numba.git@main
+numpy @ git+https://github.com/numpy/numpy.git@main
 xarray @ git+https://github.com/pydata/xarray.git@main