diff --git a/packaging/flatpak/net.catcrafts.CrafterBuild.yaml b/packaging/flatpak/net.catcrafts.CrafterBuild.yaml
index 9eeb64f..e95288d 100644
--- a/packaging/flatpak/net.catcrafts.CrafterBuild.yaml
+++ b/packaging/flatpak/net.catcrafts.CrafterBuild.yaml
@@ -106,8 +106,8 @@ modules:
       - /bin/scan-view
     sources:
       - type: archive
-        url: https://github.com/llvm/llvm-project/releases/download/llvmorg-22.1.8/llvm-project-22.1.8.src.tar.xz
-        sha256: 922f1817a0df7b1489272d18134ee0087a8b068828f87ac63b9861b1a9965888
+        url: https://github.com/llvm/llvm-project/releases/download/llvmorg-23.1.2/llvm-project-23.1.2.src.tar.xz
+        sha256: c98bbef08a2b4c2613cd50e9aa9ae7b69b1fe6c16b2c40373bc0ab6116fdf78a
 
   - name: wasi-sysroot
     # wasi-sdk's sysroot-only mode, driven by the clang built above:
@@ -155,9 +155,21 @@ modules:
         commit: 2e6fb9d8ee0cdf9e431fbcabe8af3115de000a13
         dest: src/wasi-libc
       - type: archive
-        url: https://github.com/llvm/llvm-project/releases/download/llvmorg-22.1.8/llvm-project-22.1.8.src.tar.xz
-        sha256: 922f1817a0df7b1489272d18134ee0087a8b068828f87ac63b9861b1a9965888
+        url: https://github.com/llvm/llvm-project/releases/download/llvmorg-23.1.2/llvm-project-23.1.2.src.tar.xz
+        sha256: c98bbef08a2b4c2613cd50e9aa9ae7b69b1fe6c16b2c40373bc0ab6116fdf78a
         dest: src/llvm-project
+      # wasi-sdk patches its LLVM tree before building libc++ (`git apply` in
+      # src/llvm-project), and upstream that directory is a submodule, a
+      # repository of its own. Unpacked from a tarball it is a plain
+      # subdirectory of the wasi-sdk checkout, where git treats the patched
+      # paths as outside the current directory, skips every one of them and
+      # exits 0. LLVM 22 happened to build without the patches; LLVM 23's
+      # libc++ does not compile for WASI without one of them. Making the tree
+      # a repository lets wasi-sdk's own patch step do what it does upstream,
+      # with whatever patch list the pinned tag carries.
+      - type: shell
+        commands:
+          - git init -q src/llvm-project
       - type: file
         path: wasi-host-toolchain.cmake