diff --git a/pyproject.toml b/pyproject.toml
index 8450afa2..69c01912 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ classifiers = [
 dynamic = ["description", "version"]
 dependencies = [
   "cftime",
-  "dask",
+  "dask[dataframe]",
   "distributed",
   "h5netcdf",
   "netCDF4",