diff --git a/src/authentication/pyproject.toml b/src/authentication/pyproject.toml
index 1a8dca25..abc4091e 100644
--- a/src/authentication/pyproject.toml
+++ b/src/authentication/pyproject.toml
@@ -20,7 +20,7 @@ requires-python = ">=3.10"
 [project.optional-dependencies]
 touchstone = [
   'python3-saml>=1.10.1; python_version < "3.13"',
-  'xmlsec<1.3.15; python_version < "3.13"',
+  'xmlsec<1.3.16; python_version < "3.13"',
 ]