diff --git a/.github/workflows/e2e-test.yml b/.github/workflows/e2e-test.yml
index d4e0d010..f2ec5140 100644
--- a/.github/workflows/e2e-test.yml
+++ b/.github/workflows/e2e-test.yml
@@ -19,7 +19,7 @@ jobs:
       TEST_SECRET_KEY: ${{ secrets.TEST_SECRET_KEY }}
       TEST_CHANNEL_ID_PREFIX: ${{ secrets.TEST_CHANNEL_ID_PREFIX }}
     steps:
-      - uses: eifinger/setup-rye@v2
+      - uses: eifinger/setup-rye@v3
       - uses: actions/checkout@v4
       - run: |
           sudo apt-get update
diff --git a/.python-version b/.python-version
index 8531a3b7..9f3d4c17 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.12.2
+3.9.16
diff --git a/pyproject.toml b/pyproject.toml
index 0d768583..c2ea8ab3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,13 +8,12 @@ license = { file = "LICENSE" }
 classifiers = [
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
 ]
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 
 [project.urls]
 Source = "https://github.com/shiguredo/sora-python-sdk"