diff --git a/objectivec/include/ort_enums.h b/objectivec/include/ort_enums.h
index e82765b535..d505ce2c4e 100644
--- a/objectivec/include/ort_enums.h
+++ b/objectivec/include/ort_enums.h
@@ -36,6 +36,8 @@ typedef NS_ENUM(int32_t, ORTTensorElementDataType) {
   ORTTensorElementDataTypeUInt8,
   ORTTensorElementDataTypeInt32,
   ORTTensorElementDataTypeUInt32,
+  ORTTensorElementDataTypeInt64,
+  ORTTensorElementDataTypeUInt64,
 };
 
 /**
diff --git a/objectivec/src/ort_enums.mm b/objectivec/src/ort_enums.mm
index 1a7d63decd..82191b7801 100644
--- a/objectivec/src/ort_enums.mm
+++ b/objectivec/src/ort_enums.mm
@@ -51,6 +51,8 @@ constexpr TensorElementTypeInfo kElementTypeInfos[]{
     {ORTTensorElementDataTypeUInt8, ONNX_TENSOR_ELEMENT_DATA_TYPE_UINT8, sizeof(uint8_t)},
     {ORTTensorElementDataTypeInt32, ONNX_TENSOR_ELEMENT_DATA_TYPE_INT32, sizeof(int32_t)},
     {ORTTensorElementDataTypeUInt32, ONNX_TENSOR_ELEMENT_DATA_TYPE_UINT32, sizeof(uint32_t)},
+    {ORTTensorElementDataTypeInt64, ONNX_TENSOR_ELEMENT_DATA_TYPE_INT64, sizeof(int64_t)},
+    {ORTTensorElementDataTypeUInt64, ONNX_TENSOR_ELEMENT_DATA_TYPE_UINT64, sizeof(uint64_t)},
 };
 
 struct GraphOptimizationLevelInfo {