diff --git a/pyproject.toml b/pyproject.toml
index 7265a23..35f3211 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ requires = [
     "setuptools >=64",
     "setuptools-git-versioning",
     "wheel",
-    "cffi>=1.11",
+    "cffi>=1.11,<1.16",
     "cython",
     "oldest-supported-numpy",
 ]