diff --git a/internal/controller/dashboard/customformsoverride.go b/internal/controller/dashboard/customformsoverride.go
index 67b131cf..cfacb2fa 100644
--- a/internal/controller/dashboard/customformsoverride.go
+++ b/internal/controller/dashboard/customformsoverride.go
@@ -195,6 +195,7 @@ func applyListInputOverrides(schema map[string]any, kind string, openAPIProps ma
 				"valueUri":    "/api/clusters/{cluster}/k8s/apis/instancetype.kubevirt.io/v1beta1/virtualmachineclusterinstancetypes",
 				"keysToValue": []any{"metadata", "name"},
 				"keysToLabel": []any{"metadata", "name"},
+				"allowEmpty":  true,
 			},
 		}
 		if prop, _ := openAPIProps["instanceType"].(map[string]any); prop != nil {
diff --git a/internal/controller/dashboard/customformsoverride_test.go b/internal/controller/dashboard/customformsoverride_test.go
index 37da1244..76fc4f83 100644
--- a/internal/controller/dashboard/customformsoverride_test.go
+++ b/internal/controller/dashboard/customformsoverride_test.go
@@ -202,6 +202,10 @@ func TestApplyListInputOverrides_VMInstance(t *testing.T) {
 		t.Errorf("expected valueUri %s, got %v", expectedURI, customProps["valueUri"])
 	}
 
+	if customProps["allowEmpty"] != true {
+		t.Errorf("expected allowEmpty true, got %v", customProps["allowEmpty"])
+	}
+
 	// Check disks[].name is a listInput
 	disks, ok := specProps["disks"].(map[string]any)
 	if !ok {
diff --git a/packages/system/dashboard/images/openapi-ui/Dockerfile b/packages/system/dashboard/images/openapi-ui/Dockerfile
index 4b80c960..82cc6db0 100644
--- a/packages/system/dashboard/images/openapi-ui/Dockerfile
+++ b/packages/system/dashboard/images/openapi-ui/Dockerfile
@@ -6,7 +6,7 @@ FROM node:${NODE_VERSION}-alpine AS openapi-k8s-toolkit-builder
 RUN apk add git
 WORKDIR /src
 # release/1.4.0
-ARG COMMIT=c67029cc7b7495c65ee0406033576e773a73bb01
+ARG COMMIT=d6b9e4ad0d1eb9d3730f7f0c664792c8dda3214d
 RUN wget -O- https://github.com/PRO-Robotech/openapi-k8s-toolkit/archive/${COMMIT}.tar.gz | tar -xzvf- --strip-components=1
 
 COPY openapi-k8s-toolkit/patches /patches