diff --git a/build-dist-windows.sh b/build-dist-windows.sh
index 08a4671..e6b3e5d 100644
--- a/build-dist-windows.sh
+++ b/build-dist-windows.sh
@@ -67,12 +67,19 @@ VIS_DEPS=(
     "numpy>=1.24.0,<2.0"
 )
 
-ALL_DEPS=("${CORE_DEPS[@]}" "${WIN_DEPS[@]}" "${VIS_DEPS[@]}")
+# Resolve core + visualizer deps in a SINGLE call so pip picks compatible
+# transitive versions (notably pydantic/pydantic-core must match).
+# Per-dep loops resolve each dep independently and can leave mismatched
+# transitive versions that overwrite each other in the site-packages unzip.
+CROSS_DEPS=("${CORE_DEPS[@]}" "${VIS_DEPS[@]}")
+pip download --quiet --no-cache-dir --dest "$WHEEL_DIR" \
+    --platform win_amd64 --python-version "${PYTHON_SHORT}" \
+    --implementation cp --only-binary :all: \
+    "${CROSS_DEPS[@]}"
 
-# Per-dep loop with --pre (winsdk only ships beta wheels, e.g. 1.0.0b10).
-# Single-call resolution fails when one Windows-only dep can't resolve in
-# the Linux fallback branch, so we resolve each dep independently.
-for dep in "${ALL_DEPS[@]}"; do
+# Windows-only deps in a loop with --pre: winsdk only ships beta wheels
+# (1.0.0bNN) and each dep needs its own platform/non-platform fallback.
+for dep in "${WIN_DEPS[@]}"; do
     pip download --pre --quiet --no-cache-dir --dest "$WHEEL_DIR" \
         --platform win_amd64 --python-version "${PYTHON_SHORT}" \
         --implementation cp --only-binary :all: \