diff --git a/include/onnxruntime/core/session/onnxruntime_c_api.h b/include/onnxruntime/core/session/onnxruntime_c_api.h
index b1a79f5921328..d787a5bf60fdb 100644
--- a/include/onnxruntime/core/session/onnxruntime_c_api.h
+++ b/include/onnxruntime/core/session/onnxruntime_c_api.h
@@ -4612,6 +4612,8 @@ struct OrtApi {
    * \param[in] num_keys
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.17.
    */
   ORT_API2_STATUS(SessionOptionsAppendExecutionProvider_OpenVINO_V2,
                   _In_ OrtSessionOptions* options,
@@ -4629,6 +4631,8 @@ struct OrtApi {
    * \param[in] num_keys
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.18.
    */
   ORT_API2_STATUS(SessionOptionsAppendExecutionProvider_VitisAI,
                   _In_ OrtSessionOptions* options,
@@ -4642,7 +4646,10 @@ struct OrtApi {
    *  \param[in] mem_info OrtMemoryInfo instance
    *  \param[in] count_or_bytes How many bytes is this scratch buffer
    *  \param[out] out A pointer to the scrach buffer
+   *
    *  \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.18.
    */
   ORT_API2_STATUS(KernelContext_GetScratchBuffer, _In_ const OrtKernelContext* context, _In_ const OrtMemoryInfo* mem_info, _In_ size_t count_or_bytes, _Outptr_ void** out);
 
@@ -4653,6 +4660,8 @@ struct OrtApi {
    * \param[out] out A pointer to OrtAllocator
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.18.
    */
   ORT_API2_STATUS(KernelInfoGetAllocator, _In_ const OrtKernelInfo* info, _In_ OrtMemType mem_type, _Outptr_ OrtAllocator** out);
 
@@ -4674,6 +4683,8 @@ struct OrtApi {
    * \param[in] num_external_initializer_files Number of external files
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.18.
    */
   ORT_API2_STATUS(AddExternalInitializersFromFilesInMemory, _In_ OrtSessionOptions* options,
                   _In_reads_(num_external_initializer_files) const ORTCHAR_T* const* external_initializer_file_names,
@@ -4696,6 +4707,8 @@ struct OrtApi {
    *                  OrtApi::ReleaseLoraAdapter.
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.20.
    */
   ORT_API2_STATUS(CreateLoraAdapter, const ORTCHAR_T* adapter_file_path, _In_ OrtAllocator* allocator,
                   _Outptr_ OrtLoraAdapter** out);
@@ -4714,6 +4727,8 @@ struct OrtApi {
    *                  OrtApi::ReleaseLoraAdapter.
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.20.
    */
   ORT_API2_STATUS(CreateLoraAdapterFromArray, _In_ const void* bytes, size_t num_bytes, _In_ OrtAllocator* allocator,
                   _Outptr_ OrtLoraAdapter** out);
@@ -4735,6 +4750,8 @@ struct OrtApi {
    * \param[in] adapter OrtLoraAdapter instance
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.20.
    */
   ORT_API2_STATUS(RunOptionsAddActiveLoraAdapter, _Inout_ OrtRunOptions* options, _In_ const OrtLoraAdapter* adapter);
 
@@ -4753,6 +4770,8 @@ struct OrtApi {
    * \param[in] kv_len Number of elements in the keys and values arrays
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
+   *
+   * \since Version 1.20.
    */
   ORT_API2_STATUS(SetEpDynamicOptions, _Inout_ OrtSession* sess, _In_reads_(kv_len) const char* const* keys,
                   _In_reads_(kv_len) const char* const* values, _In_ size_t kv_len);
diff --git a/onnxruntime/core/graph/contrib_ops/quantization_defs.cc b/onnxruntime/core/graph/contrib_ops/quantization_defs.cc
index 6f1f1c831d191..5a3cd86b04492 100644
--- a/onnxruntime/core/graph/contrib_ops/quantization_defs.cc
+++ b/onnxruntime/core/graph/contrib_ops/quantization_defs.cc
@@ -9,7 +9,7 @@
 #include "core/graph/constants.h"
 #include "core/graph/contrib_ops/contrib_defs.h"
 #include "core/graph/contrib_ops/shape_inference_functions.h"
-#include "onnx/onnx-ml.pb.h" // ?
+#include "core/graph/onnx_protobuf.h"
 
 // Suppress a warning: global initializer calls a non-constexpr function 'symbol' which is from
 // ONNX_OPERATOR_SET_SCHEMA_EX macro and only happens in debug build
@@ -23,7 +23,7 @@ void convTransposeShapeInference(InferenceContext& ctx);
 void convPoolShapeInference(ONNX_NAMESPACE::InferenceContext& ctx, bool use_dilation, bool require_kernel_shape,
                             int input1Idx, int input2Idx);
 namespace defs::math::utils {
-  void MatMulShapeInference(ONNX_NAMESPACE::InferenceContext& ctx, int input1Idx, int input2Idx);
+void MatMulShapeInference(ONNX_NAMESPACE::InferenceContext& ctx, int input1Idx, int input2Idx);
 }
 
 }  // namespace ONNX_NAMESPACE
@@ -822,10 +822,10 @@ ONNX_MS_OPERATOR_SET_SCHEMA(
             }
           }
 
-        if (all_lengths_known) {
-          output_shape->mutable_dim(axis)->set_dim_value(total_length);
-        }
-      }));
+          if (all_lengths_known) {
+            output_shape->mutable_dim(axis)->set_dim_value(total_length);
+          }
+        }));
 
   ONNX_MS_OPERATOR_SET_SCHEMA(QLinearWhere, 1, OpSchema()
     .SetDoc("Return elements, either from X or Y, depending on condition.")
@@ -955,7 +955,8 @@ ONNX_MS_OPERATOR_SET_SCHEMA(
               AttributeProto::INT, static_cast<int64_t>(0))
         .Attr("do_rotary", "Whether to use rotary position embedding. Default value is 0.",
               AttributeProto::INT, OPTIONAL_VALUE)
-        .Attr("past_present_share_buffer", "Corresponding past and present are same tensor, its shape is "
+        .Attr("past_present_share_buffer",
+              "Corresponding past and present are same tensor, its shape is "
               "(2, batch_size, num_heads, max_sequence_length, head_size)",
               AttributeProto::INT, OPTIONAL_VALUE)
         .Attr("mask_filter_value",
diff --git a/onnxruntime/core/session/onnxruntime_c_api.cc b/onnxruntime/core/session/onnxruntime_c_api.cc
index 109445c877786..ca6950af0227a 100644
--- a/onnxruntime/core/session/onnxruntime_c_api.cc
+++ b/onnxruntime/core/session/onnxruntime_c_api.cc
@@ -2803,12 +2803,15 @@ static constexpr OrtApi ort_api_1_to_21 = {
     &OrtApis::KernelInfoGetAllocator,
     &OrtApis::AddExternalInitializersFromFilesInMemory,
     // End of Version 18 - DO NOT MODIFY ABOVE (see above text for more information)
+    // End of Version 19 - DO NOT MODIFY ABOVE (see above text for more information)
+
     &OrtApis::CreateLoraAdapter,
     &OrtApis::CreateLoraAdapterFromArray,
     &OrtApis::ReleaseLoraAdapter,
     &OrtApis::RunOptionsAddActiveLoraAdapter,
 
     &OrtApis::SetEpDynamicOptions,
+    // End of Version 20 - DO NOT MODIFY ABOVE (see above text for more information)
 };
 
 // OrtApiBase can never change as there is no way to know what version of OrtApiBase is returned by OrtGetApiBase.
@@ -2840,6 +2843,8 @@ static_assert(offsetof(OrtApi, GetBuildInfoString) / sizeof(void*) == 254, "Size
 static_assert(offsetof(OrtApi, KernelContext_GetResource) / sizeof(void*) == 265, "Size of version 16 API cannot change");
 static_assert(offsetof(OrtApi, SessionOptionsAppendExecutionProvider_OpenVINO_V2) / sizeof(void*) == 275, "Size of version 17 API cannot change");
 static_assert(offsetof(OrtApi, AddExternalInitializersFromFilesInMemory) / sizeof(void*) == 279, "Size of version 18 API cannot change");
+// no additions in version 19
+static_assert(offsetof(OrtApi, SetEpDynamicOptions) / sizeof(void*) == 284, "Size of version 20 API cannot change");
 
 // So that nobody forgets to finish an API version, this check will serve as a reminder:
 static_assert(std::string_view(ORT_VERSION) == "1.21.0",