diff --git a/pyproject.toml b/pyproject.toml
index b2c9f4d..cc9254e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ classifiers = [
     "Programming Language :: Python :: 3",
     "Topic :: Scientific/Engineering",
 ]
-dependencies = ["ophyd_devices", "bec_lib", "websockets"]
+dependencies = ["ophyd_devices", "bec_lib", "websockets", "pyzmq"]
 
 [project.optional-dependencies]
 dev = ["black", "isort", "coverage", "pylint", "pytest", "pytest-random-order", "ophyd_devices", "bec_server"]