diff --git a/.github/workflows/code-format-check.yml b/.github/workflows/code-format-check.yml
index 3a7f81f1..6080ae6f 100644
--- a/.github/workflows/code-format-check.yml
+++ b/.github/workflows/code-format-check.yml
@@ -17,10 +17,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.9
     - name: cache weekly timestamp
       id: pip-cache
       run: |
diff --git a/ci/run_premerge_gpu.sh b/ci/run_premerge_gpu.sh
index 77c6327f..d5ae73c8 100755
--- a/ci/run_premerge_gpu.sh
+++ b/ci/run_premerge_gpu.sh
@@ -33,7 +33,7 @@ fi
 init_pipenv() {
     echo "initializing pip environment: $1"
     pipenv install update pip wheel
-    pipenv install --python=3.8 -r $1
+    pipenv install --python=3.9 -r $1
     export PYTHONPATH=$PWD
 }
 
diff --git a/ci/run_premerge_multi_gpu.sh b/ci/run_premerge_multi_gpu.sh
index ca4001d2..c00ae8e2 100755
--- a/ci/run_premerge_multi_gpu.sh
+++ b/ci/run_premerge_multi_gpu.sh
@@ -33,7 +33,7 @@ fi
 init_pipenv() {
     echo "initializing pip environment: $1"
     pipenv install update pip wheel
-    pipenv install --python=3.8 -r $1
+    pipenv install --python=3.9 -r $1
     export PYTHONPATH=$PWD
 }