diff --git a/.github/workflows/deploy_on_dev.yml b/.github/workflows/deploy_on_dev.yml
index 2cf19c1..1d5d469 100644
--- a/.github/workflows/deploy_on_dev.yml
+++ b/.github/workflows/deploy_on_dev.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9]
+        python-version: ['3.10']
 
     steps:
       - uses: actions/checkout@v2
diff --git a/.github/workflows/deploy_on_prod.yml b/.github/workflows/deploy_on_prod.yml
index ffd5b03..9ceaf9e 100644
--- a/.github/workflows/deploy_on_prod.yml
+++ b/.github/workflows/deploy_on_prod.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9]
+        python-version: ['3.10']
 
     steps:
       - uses: actions/checkout@v2
diff --git a/.github/workflows/pull-request-merge-precondition.yml b/.github/workflows/pull-request-merge-precondition.yml
index 244f5f0..cca8937 100644
--- a/.github/workflows/pull-request-merge-precondition.yml
+++ b/.github/workflows/pull-request-merge-precondition.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: ['3.10']
 
     steps:
       - uses: actions/checkout@v3