diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd1a11b..0f16ef6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -50,7 +50,7 @@ jobs:
         run: |
           set -euo pipefail
           python -m pip install --upgrade pip
-          python -m pip install -e . numpy pandas pandas_market_calendars pytz pytest pytest-cov ruff
+          python -m pip install -e . numpy pandas pandas_market_calendars pytz pytest pytest-cov ruff==0.15.22
           python -m pip install --no-deps -e external/QuantPlatformKit
 
       - name: Run Ruff