diff --git a/pyproject.toml b/pyproject.toml
index 0c28d01..3e60c33 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ authors = ["Simon Perkins <simon.perkins@gmail.com>"]
 readme = "README.rst"
 
 [tool.poetry.dependencies]
-python = "^3.10"
+python = "^3.11"
 pytest = {version = "^8.0.0", optional = true, extras = ["testing"]}
 xarray = "^2025.0"
 dask = {version = "^2024.5.0", optional = true, extras = ["testing"]}
@@ -14,7 +14,7 @@ distributed = {version = "^2024.5.0", optional = true, extras = ["testing"]}
 cacheout = "^0.16.0"
 arcae = "^0.2"
 typing-extensions = { version = "^4.12.2", python = "<3.11" }
-zarr = {version = "^2.18.3", optional = true, extras = ["testing"]}
+zarr = {version = "^3.0", optional = true, extras = ["testing"]}
 
 [tool.poetry.extras]
 testing = ["dask", "distributed", "pytest", "zarr"]
@@ -39,7 +39,7 @@ sphinx-copybutton = "^0.5.2"
 pydata-sphinx-theme = "^0.15.4"
 ipython = "^8.27.0"
 dask = "^2024.9.0"
-zarr = "^2.18.3"
+zarr = "^3.0"
 
 [tool.ruff]
 line-length = 88