diff --git a/pyproject.toml b/pyproject.toml
index 142f559..c876057 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,6 +9,7 @@ dependencies = [
     "mw>=0.4.0",
     "mwpersistence>=0.2.4",
     "mwreverts>=0.1.5",
+    "mwtypes>=0.4.0",
     "mwxml>=0.3.6",
     "pyarrow>=20.0.0",
     "yamlconf",