diff --git a/.github/workflows/test_fast.yml b/.github/workflows/test_fast.yml
index 86a3aa503e9..774a81a4d23 100644
--- a/.github/workflows/test_fast.yml
+++ b/.github/workflows/test_fast.yml
@@ -20,14 +20,20 @@ jobs:
       fail-fast: false # don't stop on first failure
       matrix:
         os: ['ubuntu-latest']
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3']
+        python-version: ['3.7', '3.8', '3.10', '3.11', '3']
         include:
+          # mac os test
           - os: 'macos-latest'
-            python-version: '3.7'
+            python-version: '3.7'  # oldest supported version
+
+          # non-utc timezone test
+          - os: 'ubuntu-latest'
+            python-version: '3.9'  # not the oldest, not the most recent version
+            time-zone: ['XXX-09:35']
 
     env:
       # Use non-UTC time zone
-      TZ: XXX-09:35
+      TZ: ${{ matrix.time-zone }}
       PYTEST_ADDOPTS: --cov --cov-append -n 5 --color=yes
 
     steps: