diff --git a/tox.ini b/tox.ini
index 9fb596579..8242cb8e2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -79,7 +79,7 @@ commands =
 
 [testenv:venv]
 # TODO(ihrachys): remove once infra supports constraints for this target
-install_command = {toxinidir}/tools/tox_install.sh unconstrained {opts} {packages}
+install_command = pip install -U {opts} {packages}
 commands = {posargs}
 
 [testenv:docs]