diff --git a/services/data/requirements.txt b/services/data/requirements.txt
index 3cde598..054e31b 100644
--- a/services/data/requirements.txt
+++ b/services/data/requirements.txt
@@ -4,7 +4,7 @@ openpyxl>=3.1          # XLSX export
 numpy>=1.26           # geometry-derived quantities, AABB clash
 ifctester>=0.8        # IDS / openBIM model validation
 trimesh>=4.0          # clash narrow phase (mesh booleans) + 2D section cuts
-manifold3d>=2.0       # boolean intersection engine for trimesh
+manifold3d>=3.5.2       # boolean intersection engine for trimesh
 scipy>=1.11           # trimesh path assembly (section drawings)
 networkx>=3.0         # trimesh path traversal (section drawings)
 shapely>=2.0          # trimesh planar paths