diff --git a/.github/workflows/build-and-test-linux.yaml b/.github/workflows/build-and-test-linux.yaml
index a0c4075e..28430784 100644
--- a/.github/workflows/build-and-test-linux.yaml
+++ b/.github/workflows/build-and-test-linux.yaml
@@ -31,6 +31,8 @@ jobs:
           - os: ubuntu-20.04
             compiler: gcc
             compiler_version: 11
+          - compiler: clang
+            compiler_version: 9
           - os: ubuntu-22.04
             compiler: clang
             compiler_version: 10