diff --git a/requirements-test.txt b/requirements-test.txt
index d2d210e..00477fc 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,6 +1,6 @@
 # Test/lint dependencies for local dev and CI.
 pytest>=9.1.1,<10
-pypdf>=6.16.2,<7
+pypdf>=6.18.0,<7
 ruff>=0.16.6,<1
 # OpenAPI contract validation for wm-serve (CI validates /openapi.json).
 openapi-spec-validator==0.9.0