diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index 1a6efc470f..63a0e1da56 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -14,7 +14,7 @@ tox==3.14.0
 coverage
 flake8==3.9.2
 pytest-cov==2.7.1
-pytest-doctestplus==0.4.0
+pytest-doctestplus==0.9.0
 h5py==2.10.0
 s3fs==0.5.1; python_version > '3.6'
 fsspec==0.8.4; python_version > '3.6'