diff --git a/libcxx.spec b/libcxx.spec
index 074f217..192d860 100644
--- a/libcxx.spec
+++ b/libcxx.spec
@@ -1,5 +1,5 @@
 Name:          libcxx
-Version:       17.0.6
+Version:       18.1.3
 Release:       1mamba
 Summary:       An implementation of the C++ standard library, targeting C++11, C++14 and above
 Group:         System/Libraries
@@ -17,6 +17,7 @@ Source5:       libcxx-17.0.5-CmakeLists.txt
 License:       MIT, BSD
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
+BuildRequires: libatomic-devel
 BuildRequires: libgcc
 ## AUTOBUILDREQ-END
 BuildRequires: cmake
@@ -80,6 +81,10 @@ cmake -G Ninja \
   -DLIBCXXABI_LIBDIR_SUFFIX:STRING=64 \
   -DLIBUNWIND_LIBDIR_SUFFIX:STRING=64 \
 %endif
+  -DCMAKE_C_COMPILER=clang \
+  -DCMAKE_CXX_COMPILER=clang++ \
+  -DLIBCXXABI_USE_LLVM_UNWINDER=OFF \
+  -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
   -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
   -DLIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY=ON \
   -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=ON \
@@ -132,6 +137,9 @@ DESTDIR=%{buildroot} ninja install-cxx install-cxxabi
 %{_libdir}/libc++abi.a
 
 %changelog
+* Sat Apr 13 2024 Automatic Build System <autodist@openmamba.org> 18.1.3-1mamba
+- automatic version update by autodist
+
 * Wed Nov 29 2023 Automatic Build System <autodist@mambasoft.it> 17.0.6-1mamba
 - automatic version update by autodist