diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 63ef01cdeb51..0e1c9ea87b66 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,6 +27,17 @@ jobs:
     env:
       CACHE_DIR: ${{ github.workspace }}/.container-cache
     steps:
+      - name: Install Clang 17.0.6
+        run: |
+          apt-get update
+          apt-get install -y software-properties-common
+          add-apt-repository -y ppa:ubuntu-toolchain-r/test
+          apt-get install -y clang-17 lldb-17
+          update-alternatives --install /usr/bin/clang clang /usr/bin/clang-17 100
+          update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-17 100
+          echo "Clang version installed:"
+      - name: Verify Clang installation
+        run: clang --version
       - name: Configure local git mirrors
         run: |
           # Our stock runners have access to certain local git caches. If these
diff --git a/build_tools/ci/build_posix.sh b/build_tools/ci/build_posix.sh
index 36e9057c973f..ea3e570c8b7e 100755
--- a/build_tools/ci/build_posix.sh
+++ b/build_tools/ci/build_posix.sh
@@ -50,7 +50,7 @@ cmake -S "$repo_root/externals/llvm-project/llvm" -B "$build_dir" \
   -DLLVM_EXTERNAL_TORCH_MLIR_SOURCE_DIR="$repo_root" \
   -DLLVM_TARGETS_TO_BUILD=host \
   -DMLIR_ENABLE_BINDINGS_PYTHON=ON \
-  -DTORCH_MLIR_ENABLE_LTC=OFF \
+  -DTORCH_MLIR_ENABLE_LTC=ON \
   -DTORCH_MLIR_ENABLE_PYTORCH_EXTENSIONS=ON
 echo "::endgroup::"