diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 99eb181..d5af8c9 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v2
diff --git a/setup.py b/setup.py
index d48ac20..36701bf 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,6 @@
             "Documentation": "https://libjcihitachi.readthedocs.io/en/latest/",
         },
         classifiers=[
-            "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: 3.11",
             "Programming Language :: Python :: 3.12",