diff --git a/src/openfe/protocols/openmm_rfe/hybridtop_protocols.py b/src/openfe/protocols/openmm_rfe/hybridtop_protocols.py
index 12b6b168d..47ac3779e 100644
--- a/src/openfe/protocols/openmm_rfe/hybridtop_protocols.py
+++ b/src/openfe/protocols/openmm_rfe/hybridtop_protocols.py
@@ -173,7 +173,7 @@ def _adaptive_settings(
         # use initial settings or default settings
         # this is needed for the CLI so we don't override user settings
         if initial_settings is not None:
-            protocol_settings = initial_settings.copy(deep=True)
+            protocol_settings = initial_settings.model_copy(deep=True)
         else:
             protocol_settings = cls.default_settings()