diff --git a/pyproject.toml b/pyproject.toml
index 19d4c5f..831291d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ include = [
 
 [tool.poetry.dependencies]
 python = ">=3.7.2, <4.0.0"
-paho-mqtt = ">=1.5.0"
+paho-mqtt = ">=1.5.0, <2.0.0"
 dash = ">=2.9.0, <3.0.0"
 dash-daq = "^0.5.0"
 plotly = ">=5"