diff --git a/requirements/conda.txt b/requirements/conda.txt
index 943c576..329869e 100644
--- a/requirements/conda.txt
+++ b/requirements/conda.txt
@@ -37,3 +37,6 @@
 # against the installed modules.
 # Unpin when this is released https://github.com/pytest-dev/pytest-cov/pull/240
 pytest
+
+# needed for mypy coverage report
+lxml
diff --git a/requirements/integration.txt b/requirements/integration.txt
index 36eeaba..67015ca 100644
--- a/requirements/integration.txt
+++ b/requirements/integration.txt
@@ -25,3 +25,6 @@ md-toc
 straitjacket
 pycalver
 lib3to6
+
+# needed for mypy coverage report
+lxml