diff --git a/debian/changelog b/debian/changelog
index 108e4cf0..29fe4c3e 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -9,6 +9,17 @@ llvm-toolchain-snapshot (1:19~++20231211102647+75193b192ad9-1~exp2) experimental
 
  -- Sylvestre Ledru <sylvestre@debian.org>  Fri, 12 Jan 2024 18:33:31 +0100
 
+llvm-toolchain-18 (1:18~++20240124100819+22683463740e-1~exp1) experimental; urgency=medium
+
+  * Branching of 18
+  * refresh libomp5 symbol list
+  * For the usage of -DLIBCXXABI_USE_LLVM_UNWINDER=OFF when we don't build unwind
+    https://github.com/llvm/llvm-project/issues/77846
+  * remove the unconditionnaly defined -DLIBUNWIND_USE_COMPILER_RT=ON
+  * Also pass -DLIBCXXABI_USE_LLVM_UNWINDER:BOOL=OFF to libcxx-wasm32-wasi builds
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Wed, 24 Jan 2024 22:14:15 +0100
+
 llvm-toolchain-snapshot (1:18~++20231211102647+75193b192ad9-1~exp1) experimental; urgency=medium
 
   [ Matthias Klose ]
diff --git a/debian/control b/debian/control
index ce9b3fdb..bb6f6e23 100644
--- a/debian/control
+++ b/debian/control
@@ -175,7 +175,7 @@ Architecture: all
 Multi-Arch: foreign
 Section: libdevel
 Depends: ${shlibs:Depends}, ${misc:Depends},
-Recommends: libclang-rt-19-dev (>= 1:16~++20230115053056+df5fc4504b86-1~exp1)
+Recommends: libclang-rt-19-dev
 Description: Clang library - Common development package
  Clang project is a C, C++, Objective C and Objective C++ front-end
  based on the LLVM compiler. Its goal is to offer a replacement to the
@@ -619,7 +619,7 @@ Section: libdevel
 Architecture: amd64 arm64 armhf i386 loong64 mips64el ppc64el ppc64 riscv64
 Depends: libomp5-19 (= ${binary:Version}), ${shlibs:Depends}, ${misc:Depends}
 Suggests: libomp-19-doc
-Breaks: libiomp-dev (<< 3.7-1), libomp-dev (<< 44)
+Breaks: libiomp-dev (<< 3.7-1)
 Provides: libomp-x.y-dev
 Conflicts: libomp-x.y-dev
 Replaces: libomp-x.y-dev
@@ -632,7 +632,6 @@ Package: libomp5-19
 Multi-Arch: same
 Architecture: amd64 arm64 armhf i386 loong64 mips64el ppc64el ppc64 riscv64
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Breaks: libomp5 (<< 44)
 Provides: libomp-x.y
 Conflicts: libomp-x.y
 Replaces: libomp-x.y
@@ -664,7 +663,6 @@ Multi-Arch: same
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Suggests: clang
-Breaks: libc++1 (<< 44)
 Provides: libc++-x.y
 Conflicts: libc++-x.y
 Replaces: libc++-x.y
@@ -688,10 +686,9 @@ Multi-Arch: same
 Depends: libc++1-19 (= ${binary:Version}), ${misc:Depends},
  libc++abi-19-dev (= ${binary:Version}),
  libunwind-19-dev [amd64 arm64 armhf i386 loong64 ppc64el ppc64 riscv64]
-Breaks: libc++-dev (<< 44), libc++abi-19-dev (<< 1:19~++20231211102647+75193b192ad9-1)
 Provides: libc++-x.y-dev
 Conflicts: libc++-x.y-dev
-Replaces: libc++-x.y-dev, libc++abi-19-dev (<< 1:19~++20231211102647+75193b192ad9-1)
+Replaces: libc++-x.y-dev
 Description: LLVM C++ Standard library (development files)
  libc++ is another implementation of the C++ standard library
  .
@@ -736,7 +733,6 @@ Architecture: any
 Multi-Arch: same
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Breaks: libc++abi1 (<< 44)
 Provides: libc++abi-x.y
 Conflicts: libc++abi-x.y
 Replaces: libc++abi-x.y
diff --git a/debian/control.in b/debian/control.in
index 3e5cec17..fcd449a2 100644
--- a/debian/control.in
+++ b/debian/control.in
@@ -175,7 +175,7 @@ Architecture: all
 Multi-Arch: foreign
 Section: libdevel
 Depends: ${shlibs:Depends}, ${misc:Depends},
-Recommends: libclang-rt-@LLVM_VERSION@-dev (>= 1:16~++20230115053056+df5fc4504b86-1~exp1)
+Recommends: libclang-rt-@LLVM_VERSION@-dev
 Description: Clang library - Common development package
  Clang project is a C, C++, Objective C and Objective C++ front-end
  based on the LLVM compiler. Its goal is to offer a replacement to the
@@ -619,7 +619,7 @@ Section: libdevel
 Architecture: amd64 arm64 armhf i386 loong64 mips64el ppc64el ppc64 riscv64
 Depends: libomp5-@LLVM_VERSION@ (= ${binary:Version}), ${shlibs:Depends}, ${misc:Depends}
 Suggests: libomp-@LLVM_VERSION@-doc
-Breaks: libiomp-dev (<< 3.7-1), libomp-dev (<< 44)
+Breaks: libiomp-dev (<< 3.7-1)
 Provides: libomp-x.y-dev
 Conflicts: libomp-x.y-dev
 Replaces: libomp-x.y-dev
@@ -632,7 +632,6 @@ Package: libomp5-@LLVM_VERSION@
 Multi-Arch: same
 Architecture: amd64 arm64 armhf i386 loong64 mips64el ppc64el ppc64 riscv64
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Breaks: libomp5 (<< 44)
 Provides: libomp-x.y
 Conflicts: libomp-x.y
 Replaces: libomp-x.y
@@ -664,7 +663,6 @@ Multi-Arch: same
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Suggests: clang
-Breaks: libc++1 (<< 44)
 Provides: libc++-x.y
 Conflicts: libc++-x.y
 Replaces: libc++-x.y
@@ -688,10 +686,9 @@ Multi-Arch: same
 Depends: libc++1-@LLVM_VERSION@ (= ${binary:Version}), ${misc:Depends},
  libc++abi-@LLVM_VERSION@-dev (= ${binary:Version}),
  libunwind-@LLVM_VERSION@-dev [amd64 arm64 armhf i386 loong64 ppc64el ppc64 riscv64]
-Breaks: libc++-dev (<< 44), libc++abi-@LLVM_VERSION@-dev (<< 1:18~++20231211102647+75193b192ad9-1)
 Provides: libc++-x.y-dev
 Conflicts: libc++-x.y-dev
-Replaces: libc++-x.y-dev, libc++abi-@LLVM_VERSION@-dev (<< 1:18~++20231211102647+75193b192ad9-1)
+Replaces: libc++-x.y-dev
 Description: LLVM C++ Standard library (development files)
  libc++ is another implementation of the C++ standard library
  .
@@ -736,7 +733,6 @@ Architecture: any
 Multi-Arch: same
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Breaks: libc++abi1 (<< 44)
 Provides: libc++abi-x.y
 Conflicts: libc++abi-x.y
 Replaces: libc++abi-x.y