diff --git a/qiskit_ibm_runtime/utils/json.py b/qiskit_ibm_runtime/utils/json.py
index 1c2e7c2878..6b1468bea5 100644
--- a/qiskit_ibm_runtime/utils/json.py
+++ b/qiskit_ibm_runtime/utils/json.py
@@ -215,7 +215,7 @@ def default(self, obj: Any) -> Any:  # pylint: disable=arguments-differ
         if hasattr(obj, "to_json"):
             return {"__type__": "to_json", "__value__": obj.to_json()}
         if isinstance(obj, QuantumCircuit):
-            kwargs = {"use_symengine": optionals.HAS_SYMENGINE}
+            kwargs: dict[str, object] = {"use_symengine": bool(optionals.HAS_SYMENGINE)}
             if _TERRA_VERSION[0] >= 1:
                 # NOTE: This can be updated only after the server side has
                 # updated to a newer qiskit version.
@@ -239,13 +239,13 @@ def default(self, obj: Any) -> Any:  # pylint: disable=arguments-differ
                 data=obj,
                 serializer=_write_parameter_expression,
                 compress=False,
-                use_symengine=optionals.HAS_SYMENGINE,
+                use_symengine=bool(optionals.HAS_SYMENGINE),
             )
             return {"__type__": "ParameterExpression", "__value__": value}
         if isinstance(obj, ParameterView):
             return obj.data
         if isinstance(obj, Instruction):
-            kwargs = {"use_symengine": optionals.HAS_SYMENGINE}
+            kwargs = {"use_symengine": bool(optionals.HAS_SYMENGINE)}
             if _TERRA_VERSION[0] >= 1:
                 # NOTE: This can be updated only after the server side has
                 # updated to a newer qiskit version.