diff --git a/pyproject.toml b/pyproject.toml
index 1d2c36d7..47ba8ac8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,11 +62,11 @@ kerchunk = [
   "h5py >=3.6.0",
   "h5netcdf",
   "xarray",
-  "zarr >=2.12.0, <3.0.0a",
+  "zarr >=2.12.0, <4.0.0",
 ]
 virtualizarr = [
   "numpy >=1.26.4",
-  "zarr >=2.12.0, <3.0.0a",
+  "zarr >=2.12.0, <4.0.0",
   "virtualizarr >=1.2.0",
   "dask",
   "h5py >=3.6.0",
@@ -79,7 +79,7 @@ dev = [
   "uv >=0.4.7",
 ]
 test = [
-  "zarr >=2.12.0, <3.0.0a",
+  "zarr >=2.12.0, <4.0.0",
   "numpy >=1.26.4",
   "mypy >=1.11.2",
   "pytest >=8.3",