More specific version...

Author: pgleeson

setup.cfg

@@ -39,7 +39,7 @@ install_requires =
    numpy
    tabulate
    attrs
-   cattrs 
+   cattrs>=23.2.3 # Issue with JSON serialisation in some versions, see https://github.com/ModECI/modelspec/issues/66
    docstring-parser
    typing_extensions;python_version<'3.8'
    typing_compat;python_version<'3.8'