diff --git a/cellxgene_schema_cli/cellxgene_schema/cli.py b/cellxgene_schema_cli/cellxgene_schema/cli.py
index 22b3e14d..1254a7ba 100644
--- a/cellxgene_schema_cli/cellxgene_schema/cli.py
+++ b/cellxgene_schema_cli/cellxgene_schema/cli.py
@@ -36,8 +36,7 @@ def schema_cli(verbose):
     type=click.Path(exists=False, dir_okay=False, writable=True),
 )
 @click.option("-i", "--ignore-labels", help="Ignore ontology labels when validating", is_flag=True)
-@click.option("-n", "--num-workers", help="Number of workers to use for parallel processing", default=1, type=int)
-def schema_validate(h5ad_file, add_labels_file, ignore_labels, num_workers):
+def schema_validate(h5ad_file, add_labels_file, ignore_labels):
     # Imports are very slow so we defer loading until Click arg validation has passed
     logger.info("Loading dependencies")
     try:
@@ -48,7 +47,7 @@ def schema_validate(h5ad_file, add_labels_file, ignore_labels, num_workers):
     logger.info("Loading validator modules")
     from .validate import validate
 
-    is_valid, _, _ = validate(h5ad_file, add_labels_file, ignore_labels=ignore_labels, n_workers=num_workers)
+    is_valid, _, _ = validate(h5ad_file, add_labels_file, ignore_labels=ignore_labels)
     if is_valid:
         sys.exit(0)
     else:
diff --git a/cellxgene_schema_cli/cellxgene_schema/validate.py b/cellxgene_schema_cli/cellxgene_schema/validate.py
index 7da436e2..ad003beb 100644
--- a/cellxgene_schema_cli/cellxgene_schema/validate.py
+++ b/cellxgene_schema_cli/cellxgene_schema/validate.py
@@ -2110,7 +2110,6 @@ def validate(
     h5ad_path: Union[str, bytes, os.PathLike],
     add_labels_file: str = None,
     ignore_labels: bool = False,
-    n_workers: int = 1,
 ) -> (bool, list, bool):
     from .write_labels import AnnDataLabelAppender
 
@@ -2130,14 +2129,8 @@ def validate(
     validator = Validator(
         ignore_labels=ignore_labels,
     )
-    with dask.config.set(
-        {
-            "num_workers": n_workers,
-            "threads_per_worker": 1,
-            "distributed.worker.memory.limit": "6GB",
-            "scheduler": "threads",
-        }
-    ):
+
+    with dask.config.set({"scheduler": "threads"}):
         validator.validate_adata(h5ad_path)
         logger.info(f"Validation complete in {datetime.now() - start} with status is_valid={validator.is_valid}")
 
diff --git a/cellxgene_schema_cli/requirements.txt b/cellxgene_schema_cli/requirements.txt
index c9498aa7..10663d52 100644
--- a/cellxgene_schema_cli/requirements.txt
+++ b/cellxgene_schema_cli/requirements.txt
@@ -2,7 +2,7 @@ anndata==0.11.2
 cellxgene-ontology-guide==1.3.0 # update before a schema migration
 click<9
 Cython<4
-dask==2024.12.0
+dask[array]==2024.12.0
 numpy<3
 pandas>2,<3
 PyYAML<7