diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5f71330..83bf763 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,9 +47,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [11, 12]
+        include:
+          - version: 11
+            os: 'ubuntu-22.04'
+          - version: 12
+            os: 'ubuntu-22.04'
 
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
 
     steps:
       - uses: actions/checkout@v4
@@ -61,7 +65,7 @@ jobs:
         env:
           CXX: clang-${{ matrix.version }}
         run: cmake -S . -B build
-          -D CMAKE_CXX_COMPILER=clang++
+          -D CMAKE_CXX_COMPILER=clang++-${{ matrix.version }}
           -D CMAKE_BUILD_TYPE:STRING=Release
           -D ${{ env.PROJECT }}_OPT_SELECT_NONSTD=ON
           -D ${{ env.PROJECT }}_OPT_BUILD_TESTS=ON