diff --git a/flopy4/mf6/_contract.py b/flopy4/mf6/_contract.py
index e285309e..520d9a71 100644
--- a/flopy4/mf6/_contract.py
+++ b/flopy4/mf6/_contract.py
@@ -1,3 +1,3 @@
 # autogenerated file, do not modify
-MF6_VERSION = "develop"
+MF6_VERSION = "unknown"
 DFN_SCHEMA_VERSION = "2.0.0.dev1"