diff --git a/src/govoplan_scheduling/backend/manifest.py b/src/govoplan_scheduling/backend/manifest.py
index 081ee39..8ca2a07 100644
--- a/src/govoplan_scheduling/backend/manifest.py
+++ b/src/govoplan_scheduling/backend/manifest.py
@@ -138,7 +138,7 @@ manifest = ModuleManifest(
     name=MODULE_NAME,
     version=MODULE_VERSION,
     dependencies=("poll",),
-    optional_dependencies=("access", "calendar", "appointments", "evaluation", "mail", "notifications", "policy", "portal", "workflow", "tasks", "idm", "organizations", "addresses"),
+    optional_dependencies=("access", "calendar", "appointments", "evaluation", "mail", "notifications", "policy", "portal", "workflow_engine", "tasks", "idm", "organizations", "addresses"),
     optional_capabilities=(
         CAPABILITY_AUTH_PRINCIPAL_RESOLVER,
         CAPABILITY_AUTH_PERMISSION_EVALUATOR,