diff --git a/pyproject.toml b/pyproject.toml
index f9ff886f1..9ae7e53a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ dependencies = [
     # array-api-compat 1.5 has https://github.com/scverse/anndata/issues/1410
     "array_api_compat>1.4,!=1.5",
     "legacy-api-wrap",
-    "zarr >=2.18.7, !=3.0.0, !=3.0.1, !=3.0.2, !=3.0.3",
+    "zarr >=2.18.7, !=3.0.0, !=3.0.1, !=3.0.2, !=3.0.3, <3.0.7",
 ]
 dynamic = [ "version" ]