diff --git a/setup.py b/setup.py
index 529d8f644..1f2301444 100644
--- a/setup.py
+++ b/setup.py
@@ -52,6 +52,7 @@
             test_extras := [
                 "deepdiff",
                 "filelock",  # for session fixtures due to pytest-xdist
+                "h5py",
                 "lxml",
                 "psutil",  # parallel pytest with '-n auto'
                 "pytest-cov",