diff --git a/pyproject.toml b/pyproject.toml
index 2195d1c..b570af2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,6 +9,7 @@ dynamic = ["version"]
 dependencies = [
     "brainglobe-atlasapi >=2.0.1",
     "brainglobe-space >=1.0.0",
+    "h5py<3.16.0",
     "imagecodecs",
     "neurom>=3",
     "numpy",