diff --git a/.github/workflows/flake8.yml b/.github/workflows/flake8.yml
index c5d0245..22e4ccc 100644
--- a/.github/workflows/flake8.yml
+++ b/.github/workflows/flake8.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: [ubuntu-latest]
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.9"]
     steps:
       - uses: actions/checkout@v2
 
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5eff8f8..af134a4 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: [ubuntu-latest]
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.9"]
     steps:
       - uses: actions/checkout@v2
 
diff --git a/.github/workflows/yapf.yml b/.github/workflows/yapf.yml
index 35fc8ce..a1b8c65 100644
--- a/.github/workflows/yapf.yml
+++ b/.github/workflows/yapf.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: [ubuntu-latest]
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.9"]
     steps:
       - uses: actions/checkout@v2