diff --git a/pyproject.toml b/pyproject.toml
index bfd8ad9..ae0400f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
     "psutil==5.9.8",
     "scikit-image==0.23.2",
     "simpleitk==2.3.1",
-    "zarr==2.18.2",
+    "zarr==2.18.3",
 ]
 description = "Code to register regions of interest with full organ datasets."
 dynamic = [