diff --git a/pyproject.toml b/pyproject.toml
index 88c4b739..c1d05563 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,6 +42,7 @@ test = [
     'gevent',
     'mock',
     'pytest~=7.0',
+    'cffi==1.17.1',
     'pytest-cov',
     'pyyaml',
     'tox',