diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 85ab148e0..068a18157 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -1440,8 +1440,14 @@ jobs:
         uses: astral-sh/setup-uv@v6
         with:
           enable-cache: true
-      - name: Install pyarrow
-        run: pip install pyarrow
+      - name: Install pyarrow + numpy
+        # numpy is needed by the embedded Python test fixture
+        # `libraries/extensions/ros2-bridge/python/test_utils.py:3`
+        # which the Rust test `typed::tests::test_python_array_code`
+        # loads via `PyModule::import(py, "test_utils")`. Missing here
+        # surfaced as `ModuleNotFoundError: No module named 'numpy'` in
+        # the 2026-05-20 nightly.
+        run: pip install pyarrow numpy
       - name: Test ROS2 bridge
         run: cargo test -p dora-ros2-bridge-python
       - name: Rust ROS2 Bridge example