diff --git a/opencv.spec b/opencv.spec
index 64318e2..a1a7e8a 100644
--- a/opencv.spec
+++ b/opencv.spec
@@ -321,6 +321,9 @@ install -pm 0644 %{S:4} .cache/ade/
 # disabling IPP because it is closed source library from intel
 
 %cmake \
+%if 0%{?fedora} > 38
+ -DCMAKE_CXX_STANDARD=17 \
+%endif
  -DCV_TRACE=OFF \
  -DWITH_IPP=OFF \
  -DWITH_ITT=OFF \
@@ -528,6 +531,7 @@ ln -s -r %{buildroot}%{_jnidir}/opencv-%{javaver}.jar %{buildroot}%{_jnidir}/ope
 - Use bundle flatbuffers, tried build with flatbuffers from system but doesn't build
 - Use oneVPL instead libmfx
 - Add WeChat QRCode
+- https://src.fedoraproject.org/rpms/opencv/pull-request/23 , upgrade C++ standard to C++17 for protobuf v4 (23.x etc.)
 
 * Thu Jul 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 4.7.0-15
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild