diff --git a/tox.ini b/tox.ini
index 3d41b52..5294834 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,6 +29,8 @@ deps =
   django32: Django~=3.2
   django41: Django~=4.1
   django42: Django~=4.2
+install_command =
+  python -I -m pip install {opts} --no-binary lxml {packages}
 commands =
   py.test tests \
    --cov --cov-report xml:reports/coverage-{envname}.xml \