diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index 662fbcc08a..b037f0e77f 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -16,7 +16,7 @@ coverage
 flake8==3.9.2
 pytest-cov==2.12.1
 pytest-doctestplus==0.10.1
-h5py==3.2.1
+h5py==3.3.0
 s3fs==2021.6.0
 fsspec==2021.6.0
 moto[server]>=1.3.14