diff --git a/pyproject.toml b/pyproject.toml
index 437ec2338..f50822157 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,6 +35,7 @@ dependencies = [
     "astropy>=6.1.3",
     "astropy-healpix>=1.0.3",
     "astroquery>=0.4.7",
+    "dask>=2024.8",
     "joblib>=1.4",
     "matplotlib>=3.9",
     "numpy>=2.0",