diff --git a/requirements.txt b/requirements.txt
index d85bf5e..ec2db8d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 asyncio-mqtt==0.16.2
 paho-mqtt==1.6.1
-pycapnp==2.0.0
+pycapnp==1.3.0
 toml==0.10.2