diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index 451dac6..e59a23a 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
         jupyter: ["true", "false"]
 
     steps: