diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index dbd6a495..f3cfa2ba 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -86,7 +86,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: install
       run: |
-        sudo apt install llvm
+        sudo apt install llvm-10
     - name: make coverage
       run: |
         CXX=clang++-10 make -j2 config=coverage native=1 coverage