diff --git a/pyproject.toml b/pyproject.toml
index 1130f72..c794588 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ dependencies = [
     "watchdog",
     "xarray",
     "xinterp",
+    "pyzmq",
 ]
 
 [project.optional-dependencies]