diff --git a/.github/workflows/dask_ml.yml b/.github/workflows/dask_ml.yml
index 3af6a110..ff166879 100644
--- a/.github/workflows/dask_ml.yml
+++ b/.github/workflows/dask_ml.yml
@@ -29,6 +29,10 @@ jobs:
         pip install git+https://github.com/optuna/optuna.git
         python -c 'import optuna'
 
+        # TODO(nabenabe0928/2024/03/12): Remove this version constraint once the following PR is merged.
+        # https://github.com/dask/distributed/pull/8575
+        # NOTE(nabenabe0928): dask-expr supports only python>=3.9.
+        pip install "dask[dataframe]<2024.3.0"
         pip install -r dask_ml/requirements.txt
     - name: Run examples
       run: |
diff --git a/.github/workflows/tensorflow.yml b/.github/workflows/tensorflow.yml
index d6977d57..d3bb0c52 100644
--- a/.github/workflows/tensorflow.yml
+++ b/.github/workflows/tensorflow.yml
@@ -31,6 +31,9 @@ jobs:
         pip install git+https://github.com/optuna/optuna-integration.git
         python -c 'import optuna_integration'
 
+        # NOTE(nabenabe0928): Got "AttributeError: module 'tensorflow' has no attribute 'estimator'".
+        # TODO(nabenabe0928): Remove this version constraint.
+        pip install "tensorflow<2.16.1"
         pip install -r tensorflow/requirements.txt
     - name: Run examples
       run: |