diff --git a/tbb.spec b/tbb.spec
index 753e607..32ab85b 100644
--- a/tbb.spec
+++ b/tbb.spec
@@ -1,7 +1,7 @@
 %define pkg_version %(echo %version | tr -d .)
 
 Name:          tbb
-Version:       2021.8.0
+Version:       2021.9.0
 Release:       1mamba
 Summary:       The Threading Building Blocks library abstracts low-level threading details
 Group:         Development/Tools
@@ -73,7 +73,7 @@ This package contains the Threading Building Blocks (TBB) documentation.
 #:<< _EOF
 %cmake -d build \
    -DCMAKE_STRIP=/bin/true \
-   -DCMAKE_CXX_FLAGS="%{optflags} -Wno-uninitialized -Wno-array-bounds -Wno-use-after-free -Wno-address"
+   -DCMAKE_CXX_FLAGS="%{optflags} -Wno-uninitialized -Wno-array-bounds -Wno-use-after-free -Wno-address -Wno-stringop-overflow"
 
 #% make CXXFLAGS="$RPM_OPT_FLAGS" tbb_build_prefix=obj
 #cp -p "%{SOURCE1}" "%{SOURCE2}" "%{SOURCE3}" .
@@ -121,6 +121,9 @@ This package contains the Threading Building Blocks (TBB) documentation.
 #%doc Getting_Started.pdf Reference.pdf Tutorial.pdf
 
 %changelog
+* Wed Apr 12 2023 Automatic Build System <autodist@mambasoft.it> 2021.9.0-1mamba
+- automatic version update by autodist
+
 * Mon Apr 03 2023 Automatic Build System <autodist@mambasoft.it> 2021.8.0-1mamba
 - automatic version update by autodist