diff --git a/ports/onnx/portfile.cmake b/ports/onnx/portfile.cmake
index 4487ecb4..4e9fac0c 100644
--- a/ports/onnx/portfile.cmake
+++ b/ports/onnx/portfile.cmake
@@ -23,7 +23,10 @@ else()
     set(USE_PROTOBUF_SHARED OFF)
 endif()
 
-find_program(PROTOC NAMES protoc PATHS "${CURRENT_HOST_INSTALLED_DIR}/tools/protobuf" REQUIRED)
+find_program(PROTOC NAMES protoc
+    PATHS "${CURRENT_HOST_INSTALLED_DIR}/tools/protobuf"
+    REQUIRED NO_DEFAULT_PATH NO_CMAKE_PATH
+)
 message(STATUS "Using protoc: ${PROTOC}")
 
 vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
@@ -65,6 +68,7 @@ vcpkg_cmake_configure(
         -DPYTHON_EXECUTABLE:FILEPATH=${PYTHON3}
         -DProtobuf_PROTOC_EXECUTABLE=${PROTOC}
         -DONNX_CUSTOM_PROTOC_EXECUTABLE=${PROTOC}
+        -DONNX_VERIFY_PROTO3=ON # --protoc_path for gen_proto.py
         -DONNX_ML=ON
         -DONNX_GEN_PB_TYPE_STUBS=ON
         -DONNX_USE_PROTOBUF_SHARED_LIBS=${USE_PROTOBUF_SHARED}
diff --git a/ports/onnx/vcpkg.json b/ports/onnx/vcpkg.json
index a0f4ccab..31f831a7 100644
--- a/ports/onnx/vcpkg.json
+++ b/ports/onnx/vcpkg.json
@@ -1,7 +1,7 @@
 {
   "name": "onnx",
   "version-semver": "1.16.0",
-  "port-version": 1,
+  "port-version": 2,
   "description": "Open standard for machine learning interoperability",
   "homepage": "https://onnx.ai",
   "license": "Apache-2.0",
diff --git a/versions/baseline.json b/versions/baseline.json
index 361898a3..581d9095 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -130,7 +130,7 @@
     },
     "onnx": {
       "baseline": "1.16.0",
-      "port-version": 1
+      "port-version": 2
     },
     "onnxruntime": {
       "baseline": "1.18.0",
diff --git a/versions/o-/onnx.json b/versions/o-/onnx.json
index a3ccb021..1f5e153b 100644
--- a/versions/o-/onnx.json
+++ b/versions/o-/onnx.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "7da4ed72675423754cd88d6ef4f7f1c0acc4903e",
+      "version-semver": "1.16.0",
+      "port-version": 2
+    },
     {
       "git-tree": "84056c069b4cc59b487fc92bbcebb5aaa22b7f9b",
       "version-semver": "1.16.0",