diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index d84fe659..28708535 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -23,7 +23,9 @@ jobs:
     - name: Install
       run: |
         python -m pip install -U pip
-        pip install --progress-bar off -U black hacking isort
+        pip install --progress-bar off -U hacking isort
+        # TODO(Shinichi): Remove version specification after black 24.x becomes stable.
+        pip install --progress-bar off -U "black<24.0.0"
 
     - name: black
       run: black . --check --diff