diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 01737876..7989c87f 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -58,7 +58,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest]
-                python-version: ['3.9']  # ADM Python 3.11 still has problems with Numpy 1.23.
+                python-version: ['3.10']  # ADM Python 3.11 still has problems with Numpy 1.23.
                 astropy-version: ['<6']  # ADM latest version.
                 fitsio-version: ['<2']  # ADM latest version.
                 numpy-version: ['<1.23']  # to keep asscalar, used by astropy.