diff --git a/pyproject.toml b/pyproject.toml
index 5d3f5d975..7e03843f8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,8 @@ classifiers = [
 dependencies = [
   "awkward>=2.5.2",
   "uproot>=5.3.0",
-  "dask[array]>=2023.4.0",
+  "dask[array]>=2024.3.0;python_version>'3.8'",
+  "dask[array]>=2023.4.0;python_version<'3.9'",
   "dask-awkward>=2024.3.0",
   "dask-histogram>=2024.3.0",
   "correctionlib>=2.3.3",
@@ -67,7 +68,8 @@ Homepage = "https://github.com/coffeateam/coffea"
 
 [project.optional-dependencies]
 dask = [
-  "distributed>=2023.4.0",
+  "distributed>=2024.3.0;python_version>'3.8'",
+  "distributed>=2023.4.0;python_version<'3.9'",
   "bokeh!=3.0.*,>=2.4.2",
 ]
 spark = [