diff --git a/setup.cfg b/setup.cfg
index 7c762e1..e5cc4e3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -51,6 +51,7 @@ testing =
     pytest-qt
     scikit-image[data]
     napari[pyqt5]!=0.4.18
+    zarr
 docs = 
     furo
     myst-parser
diff --git a/tox.ini b/tox.ini
index 12b00bf..60d9c89 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,6 +31,6 @@ deps =
     pytest-cov  # https://pytest-cov.readthedocs.io/en/latest/
     pytest-qt
     scikit-image[data]
-    napari[pyqt5]
+    napari[pyqt5]!=0.4.18
     zarr
 commands = pytest -v --color=yes --cov=affinder --cov-report=xml