diff --git a/environment.devenv.yml b/environment.devenv.yml
index 39108d1..1ab97a3 100644
--- a/environment.devenv.yml
+++ b/environment.devenv.yml
@@ -21,7 +21,7 @@ dependencies:
   - imagecodecs
   - pillow
   - tifffile>=2021.6.14
-  - zarr
+  - zarr<3.0
 
   # development dependencies
   - pre-commit        # [ TIFFSLIDE_DEVEL ]
diff --git a/pyproject.toml b/pyproject.toml
index 88b9310..2e2e7cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ dependencies = [
   "fsspec!=2022.11.0,!=2023.1.0",
   "pillow",
   "tifffile>=2021.6.14",
-  "zarr>=2.11.0",
+  "zarr>=2.11.0,<3.0",
   "typing_extensions>=4.0",
 ]
 dynamic = ["version"]