diff --git a/requirements-build.txt b/requirements-build.txt
index a22a0bfc..ebe941d3 100644
--- a/requirements-build.txt
+++ b/requirements-build.txt
@@ -8,7 +8,7 @@ calver==2025.10.20
     # via trove-classifiers
 cffi==2.0.0
     # via cryptography
-cython==3.2.5
+cython==3.3.0
     # via pyyaml
 flit-core==3.12.0
     # via