diff --git a/requirements.txt b/requirements.txt
index 995ad0d..a572765 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 asyncio-mqtt
-pycapnp
+pycapnp==1.3.0
 prometheus_client
 requests
 prometheus-async
-aiohttp
\ No newline at end of file
+aiohttp