diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 74865e3..1efd985 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -37,18 +37,29 @@ jobs:
     - name: Setup Python Environment
       run: |
         VENV=/volume1/gitea/python_venv
-        if [ ! -f "$VENV/bin/pip" ]; then
-          echo "=== 최초 1회 venv 생성 및 패키지 설치 ==="
-          /usr/bin/python3 -m venv "$VENV"
+        # numpy import 가능 여부로 설치 완료 판단 (pip만 있어도 설치 실패일 수 있음)
+        if ! "$VENV/bin/python" -c "import numpy, pandas, yaml" 2>/dev/null; then
+          echo "=== venv 설치 (ARM 사전빌드 휠 사용) ==="
+          # venv가 없으면 생성
+          [ ! -f "$VENV/bin/pip" ] && /usr/bin/python3 -m venv "$VENV"
           "$VENV/bin/pip" install --upgrade pip --quiet
-          "$VENV/bin/pip" install "numpy==1.24.4" "pandas==2.0.3" \
-            yfinance pyyaml openpyxl --quiet --prefer-binary
+          # piwheels: ARM(armv7l) 사전빌드 휠 저장소
+          # numpy 먼저 설치 → pandas 빌드 시 oldest-supported-numpy 1.17.3 소스빌드 방지
+          "$VENV/bin/pip" install --prefer-binary \
+            --extra-index-url https://www.piwheels.org/simple/ \
+            "numpy>=1.20,<2" --quiet
+          "$VENV/bin/pip" install --prefer-binary \
+            --extra-index-url https://www.piwheels.org/simple/ \
+            "pandas>=1.5,<3" yfinance pyyaml openpyxl --quiet
           if [ -f requirements.txt ]; then
-            "$VENV/bin/pip" install -r requirements.txt --quiet --prefer-binary
+            "$VENV/bin/pip" install --prefer-binary \
+              --extra-index-url https://www.piwheels.org/simple/ \
+              -r requirements.txt --quiet
           fi
+          "$VENV/bin/python" -c "import numpy, pandas; print('numpy', numpy.__version__, '/ pandas', pandas.__version__)"
           echo "venv 설치 완료"
         else
-          echo "=== venv 재사용: $("$VENV/bin/python" --version 2>&1) ==="
+          "$VENV/bin/python" -c "import numpy, pandas; print('=== venv 재사용:', 'numpy', numpy.__version__, '/ pandas', pandas.__version__, '===')"
         fi
         # 이후 모든 스텝에서 venv python 사용
         echo "$VENV/bin" >> $GITHUB_PATH