diff --git a/tox.ini b/tox.ini
index ef1b3f7..18520fe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -82,6 +82,7 @@ setenv =
     PYTHONDEVMODE=1
     PIP_DISABLE_PIP_VERSION_CHECK=1
     UNSAFE_PYO3_SKIP_VERSION_CHECK=1
+pip_pre = true
 
 [testenv:py312]
 setenv =