diff --git a/bo4e/tox.env b/bo4e/tox.env
index fa5270c..d775606 100644
--- a/bo4e/tox.env
+++ b/bo4e/tox.env
@@ -1 +1 @@
-BO4E_VERSION=v202401.4.0
+BO4E_VERSION=v202401.6.0