diff --git a/.github/workflows/ci_testing.yml b/.github/workflows/ci_testing.yml
index bcc3a24f0b61c3b4856a6a4c79af84e4302d5246..2fc2e6f018587da71f1c22e0f57b9f5738f0c4af 100644
--- a/.github/workflows/ci_testing.yml
+++ b/.github/workflows/ci_testing.yml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
        os: [ubuntu-latest, macos-latest]
-       python-version: ["3.10", "3.11", "3.12"]
+       python-version: ["3.9", "3.10", "3.11"]
     defaults:
       run:
         shell: bash -l {0}