diff --git a/ci/requirements_dev.txt b/ci/requirements_dev.txt
index 20f8a03..cbc8a0d 100644
--- a/ci/requirements_dev.txt
+++ b/ci/requirements_dev.txt
@@ -6,6 +6,7 @@ coverage
 pylint
 pytest
 pytest-trio
+pytest-cov>=2.6.0
 Sphinx
 sphinx-rtd-theme