diff --git a/pyproject.toml b/pyproject.toml
index 6456bba..0382dc5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
+    "bec-server~=2.7",
     "black~=24.0",
     "isort~=5.0",
     "coverage~=7.4",