diff --git a/.riahub/workflows/train.yaml b/.riahub/workflows/train.yaml
index fa07433..05b8697 100644
--- a/.riahub/workflows/train.yaml
+++ b/.riahub/workflows/train.yaml
@@ -361,7 +361,9 @@ jobs:
           # FAST-PATH: install CPU torch from pytorch.org/whl/cpu FIRST (~200MB).
           # This makes torch==X already-satisfied so requirements.txt does not
           # pull the 755MB manylinux wheel with bundled CUDA from PyPI default.
-          $PIP install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple torch==2.2.2 torchvision
+          $PIP install --index-url https://download.pytorch.org/whl/cpu --extra-index-url https://pypi.org/simple "numpy<2" "torch==2.2.2" torchvision
+          # Also ensure numpy<2 is pinned for the requirements.txt install below
+          $PIP install --upgrade --force-reinstall "numpy<2"
           INSTALLED_SOMETHING=0
           if [[ -f requirements.txt ]]; then
             $PIP install -r requirements.txt