diff --git a/pyproject.toml b/pyproject.toml
index 90b1ad3..5abb2ab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,7 @@ dev = [
 ]
 
 tests = [
+    "nomad-schema-plugin-simulation-workflow@git+https://github.com/nomad-coe/nomad-schema-plugin-simulation-workflow.git@develop",
     "nomad-schema-plugin-run@git+https://github.com/nomad-coe/nomad-schema-plugin-run.git@develop",
 ]