diff --git a/.github/workflows/python-coverage.yml b/.github/workflows/python-coverage.yml
index cd24264d..bc5e4fb5 100644
--- a/.github/workflows/python-coverage.yml
+++ b/.github/workflows/python-coverage.yml
@@ -28,7 +28,6 @@ jobs:
         python -m pip install --progress-bar off --upgrade pip setuptools
         pip install --progress-bar off .[optional]
         pip install --progress-bar off .[test]
-        pip install --progress-bar off "optuna>=3.1.0"
         pip install --progress-bar off .
         echo 'import coverage; coverage.process_startup()' > sitecustomize.py
     - name: Tests
diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index 2973ab06..8f0ff58c 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -20,7 +20,6 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --progress-bar off --upgrade pip setuptools
-          pip install --progress-bar off "optuna>=3.1.0"
           pip install --progress-bar off .
           pip install --progress-bar off flake8 black isort mypy mypy-boto3-s3
       - run: flake8 . --show-source