diff --git a/docker/requirements_simple.txt b/docker/requirements_simple.txt
index 010a90179d56ac68d1e1eeb79d2f8dc48662c980..08567130e95692a8c41a0c4bd5dc2a315b75c3e2 100644
--- a/docker/requirements_simple.txt
+++ b/docker/requirements_simple.txt
@@ -4,3 +4,5 @@
 -e git+https://github.com/OpenMDAO/OpenMDAO.git#egg=openmdao
 # sphinx read-the-docs theme for documentation
 sphinx_rtd_theme
+# pytest-cov for coverage report
+pytest-cov
\ No newline at end of file