diff --git a/requirements.txt b/requirements.txt
index 3cefb7e6a7..df2e8b7343 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ prompt-toolkit==3.0.8
 pygments==2.12.0
 
 # install:serial
-pyserial>=3.5
+pyserial==3.4
 pyserial-asyncio==0.6
 
 # install:datastore