diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7d8a2d0..ccdf863 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,40 +30,10 @@ jobs:
         # NOTE: Testing of the Windows targets are currently disabled because
         #       the test script is simply not ready for it.
         target:
-        # Python 3.6
-        - python: '3.6'
-          os: Linux
-          builder: ubuntu-20.04
-        - python: '3.6'
-          os: macOS
-          builder: macos-13
-        # - python: '3.6'
-        #   os: Windows
-        #   builder: windows-2019
-        # Python 3.7
-        - python: '3.7'
-          os: Linux
-          builder: ubuntu-20.04
-        - python: '3.7'
-          os: macOS
-          builder: macos-12
-        # - python: '3.7'
-        #   os: Windows
-        #   builder: windows-2019
-        # Python 3.8
-        - python: '3.8'
-          os: Linux
-          builder: ubuntu-20.04
-        - python: '3.8'
-          os: macOS
-          builder: macos-13
-        # - python: '3.8'
-        #   os: Windows
-        #   builder: windows-2019
         # Python 3.9
         - python: '3.9'
           os: Linux
-          builder: ubuntu-20.04
+          builder: ubuntu-22.04
         - python: '3.9'
           os: macOS
           builder: macos-13