diff --git a/deepmd/dpmodel/fitting/property_fitting.py b/deepmd/dpmodel/fitting/property_fitting.py
index 7845833ab9..2906bed62c 100644
--- a/deepmd/dpmodel/fitting/property_fitting.py
+++ b/deepmd/dpmodel/fitting/property_fitting.py
@@ -123,7 +123,7 @@ def __init__(
     @classmethod
     def deserialize(cls, data: dict) -> "PropertyFittingNet":
         data = data.copy()
-        check_version_compatibility(data.pop("@version"), 3, 1)
+        check_version_compatibility(data.pop("@version"), 4, 1)
         data.pop("dim_out")
         data.pop("var_name")
         data.pop("tot_ener_zero")
@@ -145,5 +145,6 @@ def serialize(self) -> dict:
             "property_name": self.property_name,
             "property_dim": self.property_dim,
         }
+        dd["@version"] = 4
 
         return dd
diff --git a/deepmd/pt/model/task/property.py b/deepmd/pt/model/task/property.py
index 4c0817c175..d48751487d 100644
--- a/deepmd/pt/model/task/property.py
+++ b/deepmd/pt/model/task/property.py
@@ -146,7 +146,7 @@ def output_def(self) -> FittingOutputDef:
     @classmethod
     def deserialize(cls, data: dict) -> "PropertyFittingNet":
         data = data.copy()
-        check_version_compatibility(data.pop("@version", 1), 3, 1)
+        check_version_compatibility(data.pop("@version", 1), 4, 1)
         data.pop("dim_out")
         data.pop("var_name")
         obj = super().deserialize(data)
@@ -163,6 +163,7 @@ def serialize(self) -> dict:
             "property_name": self.property_name,
             "property_dim": self.property_dim,
         }
+        dd["@version"] = 4
 
         return dd