diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 9de2dcd..34a203a 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -36,7 +36,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os: [almalinux8]
+        os: [almalinux8, almalinux9]
     steps:
       - name: Checkout code
         uses: actions/checkout@v4