diff --git a/pyproject.toml b/pyproject.toml
index f82483404..8d82c11d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,9 +55,9 @@ all = [
     "cachetools",
     "cachey",
     "click !=8.1.0",
-    "dask",
-    "dask[array]",
-    "dask[dataframe]",
+    "dask <2024.3.0",
+    "dask[array] <2024.3.0",
+    "dask[dataframe] <2024.3.0",
     "entrypoints",
     "fastapi",
     "h5netcdf",
@@ -100,7 +100,7 @@ all = [
 ]
 # These are needed by the client and server to transmit/receive arrays.
 array = [
-    "dask[array]",
+    "dask[array] <2024.3.0",
     "numpy",
 ]
 # This is the "kichen sink" fully-featured client dependency set.
@@ -109,8 +109,8 @@ client = [
     "awkward >=2.4.3",
     "blosc",
     "click !=8.1.0",
-    "dask[array]",
-    "dask[dataframe]",
+    "dask[array] <2024.3.0",
+    "dask[dataframe] <2024.3.0",
     "entrypoints",
     "httpx >=0.20.0,!=0.23.1",
     "jsonschema",
@@ -137,7 +137,7 @@ compression = [
 ]
 # These are needed by the client and server to transmit/receive dataframes.
 dataframe = [
-    "dask[dataframe]",
+    "dask[dataframe] <2024.3.0",
     "pandas",
     "pyarrow",
 ]
@@ -195,7 +195,7 @@ minimal-server = [
     "cachey",
     "cachetools",
     "click !=8.1.0",
-    "dask",
+    "dask <2024.3.0",
     "fastapi",
     "httpx >=0.20.0,!=0.23.1",
     "canonicaljson",
@@ -235,9 +235,9 @@ server = [
     "cachetools",
     "cachey",
     "click !=8.1.0",
-    "dask",
-    "dask[array]",
-    "dask[dataframe]",
+    "dask <2024.3.0",
+    "dask[array] <2024.3.0",
+    "dask[dataframe] <2024.3.0",
     "fastapi",
     "h5netcdf",
     "h5py",
@@ -284,7 +284,7 @@ sparse = [
 ]
 # These are needed by the client and server to transmit/receive xarrays.
 xarray = [
-    "dask[array]",
+    "dask[array] <2024.3.0",
     "pandas",
     "pyarrow",
     "xarray",