diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 449e704..dae1f8d 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -186,6 +186,12 @@ jobs:
           artifact-name: contract.test-actions-off.tar.gz
           token: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: install LLVM
+        id: install-llvm
+        run: |
+          wget https://apt.llvm.org/llvm.sh
+	  chmod +x llvm.sh
+	  sudo ./llvm.sh 11.0.0
       - name: Extract EOS EVM Contract
         id: evm-contract
         run: |