diff --git a/services/data/requirements.txt b/services/data/requirements.txt
index 33979fd2a..5013953ee 100644
--- a/services/data/requirements.txt
+++ b/services/data/requirements.txt
@@ -2,7 +2,7 @@
 ifcopenshell>=0.8.5,<0.9
 openpyxl>=3.1.5          # XLSX export
 numpy>=2.5.3           # geometry-derived quantities, AABB clash
-ifctester>=0.8        # IDS / openBIM model validation
+ifctester>=0.9.0        # IDS / openBIM model validation
 # Held at 4.12.2, which is what `services/api/requirements.lock` pins and therefore what the
 # container actually runs — this file is NOT installed anywhere (the API image installs only that
 # lock, and CI installs it too). Dependabot raised this to >=5.0.0 in #229 and every check went