diff --git a/requirements.txt b/requirements.txt
index 93e2b8e4..6117e5fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,19 @@
+# Requires Python <=3.11 (numpy 1.24.4 does not build on Python 3.12+)
+
+# Pin torch/torchaudio — must match a version that torbi ships prebuilt binaries for
+# (2.6, 2.7, or 2.8) and that pyannote.audio 3.3.0 supports
+torch==2.6.0
+torchaudio==2.6.0
+
+# Pin numpy — required by brouhaha-vad (pinned to ==1.24.4)
+numpy==1.24.4
+
+# Pin scipy/scikit-learn/torchmetrics to versions compatible with numpy 1.24
+scipy<1.12
+scikit-learn<1.4
+torchmetrics<1.3
+
+# Direct dependencies
 datasets[audio]
 https://github.com/marianne-m/brouhaha-vad/archive/main.zip
 penn