diff --git a/.github/workflows/paddle_wheel.yaml b/.github/workflows/paddle_wheel.yaml
index 7b330bf8f..7d3b664e2 100644
--- a/.github/workflows/paddle_wheel.yaml
+++ b/.github/workflows/paddle_wheel.yaml
@@ -81,6 +81,9 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
+        with:
+          # Avoid GitHub's synthetic PR merge ref; test the PR head commit directly.
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Setup conda environment
         uses: conda-incubator/setup-miniconda@v3
@@ -97,7 +100,7 @@ jobs:
 
       - name: Install PaddlePaddle nightly
         run: |
-          pip install --pre paddlepaddle -i https://www.paddlepaddle.org.cn/packages/nightly/cpu/
+          pip install --pre paddlepaddle==3.4.0.dev20251223 -i https://www.paddlepaddle.org.cn/packages/nightly/cpu/
 
       - name: Run pre-build script
         run: |
@@ -178,6 +181,9 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
+        with:
+          # Avoid GitHub's synthetic PR merge ref; test the PR head commit directly.
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Download wheel artifact
         uses: actions/download-artifact@v4
@@ -206,7 +212,7 @@ jobs:
 
       - name: Install PaddlePaddle nightly in conda env
         run: |
-          pip install --pre paddlepaddle -i https://www.paddlepaddle.org.cn/packages/nightly/cpu/
+          pip install --pre paddlepaddle==3.3.1 -i https://www.paddlepaddle.org.cn/packages/stable/cpu/
 
       - name: Install paddlecodec from wheel
         run: |