diff --git a/requirements/requirements-test.txt b/requirements/requirements-test.txt
index 1a4246dcc..e8a3da525 100644
--- a/requirements/requirements-test.txt
+++ b/requirements/requirements-test.txt
@@ -1,7 +1,7 @@
 ase==3.22.1
 cmake==3.28.3
 coverage==7.4.3
-cython==3.0.8
+cython==3.0.9
 dynasor==1.1.1; platform_system != "Windows"
 GitPython==3.1.42
 gsd==3.2.1