diff --git a/VERSION b/VERSION
index 46e8233..6e09167 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v0.28.2
+v0.28.3
diff --git a/api/models/rest_health_response.go b/api/models/rest_health_response.go
index 9282ef4..f02eb95 100644
--- a/api/models/rest_health_response.go
+++ b/api/models/rest_health_response.go
@@ -24,8 +24,7 @@ type RestHealthResponse struct {
 	Message *string `json:"message" yaml:"message"`
 
 	// services
-	// Required: true
-	Services map[string]RestHealthResult `json:"services" yaml:"services"`
+	Services map[string]RestHealthResult `json:"services,omitempty" yaml:"services,omitempty"`
 
 	// status
 	// Required: true
@@ -64,9 +63,8 @@ func (m *RestHealthResponse) validateMessage(formats strfmt.Registry) error {
 }
 
 func (m *RestHealthResponse) validateServices(formats strfmt.Registry) error {
-
-	if err := validate.Required("services", "body", m.Services); err != nil {
-		return err
+	if swag.IsZero(m.Services) { // not required
+		return nil
 	}
 
 	for k := range m.Services {
@@ -115,10 +113,6 @@ func (m *RestHealthResponse) ContextValidate(ctx context.Context, formats strfmt
 
 func (m *RestHealthResponse) contextValidateServices(ctx context.Context, formats strfmt.Registry) error {
 
-	if err := validate.Required("services", "body", m.Services); err != nil {
-		return err
-	}
-
 	for k := range m.Services {
 
 		if val, ok := m.Services[k]; ok {
diff --git a/api/models/rest_health_result.go b/api/models/rest_health_result.go
index 6ad3498..cd386a2 100644
--- a/api/models/rest_health_result.go
+++ b/api/models/rest_health_result.go
@@ -24,8 +24,7 @@ type RestHealthResult struct {
 	Message *string `json:"message" yaml:"message"`
 
 	// services
-	// Required: true
-	Services map[string]RestHealthResult `json:"services" yaml:"services"`
+	Services map[string]RestHealthResult `json:"services,omitempty" yaml:"services,omitempty"`
 
 	// status
 	// Required: true
@@ -64,9 +63,8 @@ func (m *RestHealthResult) validateMessage(formats strfmt.Registry) error {
 }
 
 func (m *RestHealthResult) validateServices(formats strfmt.Registry) error {
-
-	if err := validate.Required("services", "body", m.Services); err != nil {
-		return err
+	if swag.IsZero(m.Services) { // not required
+		return nil
 	}
 
 	for k := range m.Services {
@@ -115,10 +113,6 @@ func (m *RestHealthResult) ContextValidate(ctx context.Context, formats strfmt.R
 
 func (m *RestHealthResult) contextValidateServices(ctx context.Context, formats strfmt.Registry) error {
 
-	if err := validate.Required("services", "body", m.Services); err != nil {
-		return err
-	}
-
 	for k := range m.Services {
 
 		if val, ok := m.Services[k]; ok {
diff --git a/metal-api.json b/metal-api.json
index 82c945b..0f20813 100644
--- a/metal-api.json
+++ b/metal-api.json
@@ -369,7 +369,6 @@
       },
       "required": [
         "message",
-        "services",
         "status"
       ]
     },
@@ -390,7 +389,6 @@
       },
       "required": [
         "message",
-        "services",
         "status"
       ]
     },
@@ -5406,7 +5404,7 @@
       "url": "https://www.gnu.org/licenses/agpl-3.0.de.html"
     },
     "title": "metal-api",
-    "version": "v0.28.2"
+    "version": "v0.28.3"
   },
   "paths": {
     "/v1/audit/find": {