diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6ec79e50..cc8180c4 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -78,7 +78,7 @@ jobs:
         run: |
           conda activate env
           # TODO: remove --pre option when zarr v3 is out
-          python -m pip install --pre zarr
+          python -m pip install --pre zarr>=3.0.0b2
 
       # This is used to test with zfpy, which does not yet support numpy 2.0
       - name: Install older numpy and zfpy
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index bf6a751b..1a471f2e 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -31,4 +31,4 @@ repos:
       hooks:
       -   id: mypy
           args: [--config-file, pyproject.toml]
-          additional_dependencies: [numpy, pytest, zfpy, 'zarr==3.0.0b1']
+          additional_dependencies: [numpy, pytest, zfpy, 'zarr>=3.0.0b2']
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 3189c9f5..fa14bf34 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -9,7 +9,7 @@ build:
     python: "3.12"
   jobs:
     post_install:
-      - python -m pip install --pre 'zarr'
+      - python -m pip install --pre 'zarr>=3.0.0b2'
 
 sphinx:
   configuration: docs/conf.py
diff --git a/numcodecs/tests/test_zarr3.py b/numcodecs/tests/test_zarr3.py
index afb77136..cdc9b206 100644
--- a/numcodecs/tests/test_zarr3.py
+++ b/numcodecs/tests/test_zarr3.py
@@ -36,7 +36,7 @@
 
 @pytest.fixture
 def store() -> StorePath:
-    return StorePath(MemoryStore(mode="w"))
+    return StorePath(MemoryStore(read_only=False))
 
 
 ALL_CODECS = [getattr(numcodecs.zarr3, cls_name) for cls_name in numcodecs.zarr3.__all__]