diff --git a/services/data/requirements.txt b/services/data/requirements.txt
index 3cde598..8b3c079 100644
--- a/services/data/requirements.txt
+++ b/services/data/requirements.txt
@@ -8,6 +8,6 @@ manifold3d>=2.0       # 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
-reportlab>=4.0        # PDF sheet composition
+reportlab>=5.0.0        # PDF sheet composition
 # svglib (SVG→PNG for docs gallery) is a dev-only tool — it pulls pycairo/cairo and is not
 # needed at runtime (the API serves SVG directly). Install ad hoc when regenerating docs/img.