diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 327cafe..00c329c 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -18,7 +18,7 @@ jobs:
             matrix:
                 os: [ubuntu-latest]
                 python-version: ['3.9', '3.10']  #, '3.11'] There are still issues with Numpy <1.23 and 3.11.
-                numpy-version: ['<1.23']
+                numpy-version: ['<1.23', '<1.24', '<2.0']
                 astropy-version: ['<5.1', '<6.0', '<7.0']
 
         steps:
@@ -47,7 +47,7 @@ jobs:
             matrix:
                 os: [ubuntu-latest]
                 python-version: ['3.10']
-                astropy-version: ['<5.1']
+                # astropy-version: ['<5.1'] not used at this time.
 
         steps:
             - name: Checkout code