diff --git a/requirements.txt b/requirements.txt
index 4652b67b..4f7ff48f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ pytest-cov==6.2.1
 zarr==2.18.4
 ruff==0.8.6
 netcdf4==1.7.2
-h5netcdf==1.6.1
+h5netcdf==1.6.4
 impactlab-tools==0.6.0
 p_tqdm==1.4.2
 pyarrow==19.0.1