diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index d7d65c43..35b46736 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -6,7 +6,7 @@ pandas==2.1.3
 scikit-learn==1.3.2
 h5py==3.10.0
 numexpr==2.8.7
-zarr==2.14.2
+zarr==2.16.1
 hmmlearn==0.3.0
 pomegranate==1.0.3
 pyfasta==0.5.2