diff --git a/.github/workflows/documentation.yaml b/.github/workflows/documentation.yaml
index c8cf7cb86cf..3ef35227c13 100644
--- a/.github/workflows/documentation.yaml
+++ b/.github/workflows/documentation.yaml
@@ -27,10 +27,10 @@ jobs:
           mkdir ${{ env.LLVM_DIR }}
           tar xf llvm.tar.xz --strip-components=1 -C ${{ env.LLVM_DIR }}
           echo "${{ env.LLVM_DIR }}/bin" >> $GITHUB_PATH
-          echo "LLVM_SYS_120_PREFIX=${{ env.LLVM_DIR }}" >> $GITHUB_ENV
+          echo "LLVM_SYS_180_PREFIX=${{ env.LLVM_DIR }}" >> $GITHUB_ENV
         env:
-          LLVM_DIR: ${{ github.workspace }}/llvm-13
-          LLVM_URL: 'https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz'
+          LLVM_DIR: ${{ github.workspace }}/llvm-18
+          LLVM_URL: 'https://github.com/wasmerio/llvm-custom-builds/releases/download/18.x/llvm-linux-amd64.tar.xz'
       - name: Build & package documentation
         run: make package-docs
       - name: Publish documentation