diff --git a/pyproject.toml b/pyproject.toml
index 4545c9d..c28dbac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ build-backend = "mesonpy"
 requires = [
   "meson-python",
   "meson >= 1.3.0",
-  "Cython >= 3.0",
+  "Cython ~= 3.1.8",
   "numpy >= 2.0.0rc1",
   "GitPython",
 ]