diff --git a/.riahub/workflows/train.yaml b/.riahub/workflows/train.yaml
index 05b8697..a3c1537 100644
--- a/.riahub/workflows/train.yaml
+++ b/.riahub/workflows/train.yaml
@@ -380,6 +380,10 @@ jobs:
             exit 1
           fi
           $PIP install h5py scipy
+          # After requirements.txt, force numpy back to <2 (torch 2.2.2 has
+          # NumPy 1.x ABI; transitive deps in requirements.txt would
+          # otherwise leave numpy 2.x in place and crash at runtime).
+          $PIP install --upgrade --force-reinstall "numpy<2"
           TORCH_INDEX_URL="https://download.pytorch.org/whl/cpu"
           TORCH_REASON="no NVIDIA GPU detected"
           if command -v nvidia-smi &> /dev/null; then