From 77799ec529a93f4f772d4f61d64f87575a68c853 Mon Sep 17 00:00:00 2001
From: Sergei Silnov <sergei.silnov@espressif.com>
Date: Thu, 21 Oct 2021 11:43:19 +0200
Subject: [PATCH] Tools: Constrain the cffi package for older pythons

---
 requirements.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/requirements.txt b/requirements.txt
index 4b56d265cc..438be62a65 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,6 @@ setuptools
 pyserial>=3.0
 future>=0.15.2
 cryptography>=2.1.4,<35
+# cffi 1.15 supports Python 3.6+ only
+cffi<1.15;python_version<'3.6'
 pyparsing>=2.0.3,<2.4.0