diff --git a/contrib/requirements/requirements.txt b/contrib/requirements/requirements.txt
index 04b0a77f3..0f2dd7b5c 100644
--- a/contrib/requirements/requirements.txt
+++ b/contrib/requirements/requirements.txt
@@ -1,5 +1,5 @@
 qrcode
-protobuf>=3.12
+protobuf>=3.12,<4
 qdarkstyle>=2.7
 aiorpcx>=0.22.0,<0.23
 aiohttp>=3.3.0,<4.0.0