diff --git a/.ci/docker/requirements.txt b/.ci/docker/requirements.txt
index 157647e887..9d960a5e27 100644
--- a/.ci/docker/requirements.txt
+++ b/.ci/docker/requirements.txt
@@ -21,6 +21,12 @@ pytorch_sphinx_theme2==0.4.9
 # Tutorial dependencies
 tqdm==4.66.1
 numpy==1.26.4
+# Pin pyarrow: 26.0.0 requires NumPy >= 2.0 at import, while numba and spacy keep
+# numpy below 2. Its wheels declare no numpy requirement, so pip does not catch it.
+pyarrow<26
+# Pin pandas: 3.0 makes Series.values read-only (copy-on-write), which breaks Ax 0.4.x
+# ("assignment destination is read-only" in its winsorize transform).
+pandas<3
 pydantic>=2.10
 # Pin fastapi: 0.139.2 made router route building thread-safe by adding an
 # _effective_routes_lock (threading.Lock) to APIRouter, which ray[serve]'s