diff --git a/cmd/prometheus/testdata/features.json b/cmd/prometheus/testdata/features.json
index 4c893daae2..4f74b7e810 100644
--- a/cmd/prometheus/testdata/features.json
+++ b/cmd/prometheus/testdata/features.json
@@ -4,6 +4,8 @@
     "exclude_alerts": true,
     "label_values_match": true,
     "lifecycle": false,
+    "openapi_3.1": true,
+    "openapi_3.2": true,
     "otlp_write_receiver": false,
     "query_stats": true,
     "query_warnings": true,
diff --git a/web/web.go b/web/web.go
index aec2f2d4ee..cb9258d87f 100644
--- a/web/web.go
+++ b/web/web.go
@@ -427,6 +427,8 @@ func New(logger *slog.Logger, o *Options) *Handler {
 		r.Enable(features.API, "time_range_series")  // start/end parameters for /series endpoint.
 		r.Enable(features.API, "time_range_labels")  // start/end parameters for /labels endpoints.
 		r.Enable(features.API, "exclude_alerts")     // exclude_alerts parameter for /rules endpoint.
+		r.Enable(features.API, "openapi_3.1")        // OpenAPI 3.1 specification support.
+		r.Enable(features.API, "openapi_3.2")        // OpenAPI 3.2 specification support.
 		r.Set(features.UI, "ui_v3", !o.UseOldUI)
 		r.Set(features.UI, "ui_v2", o.UseOldUI)
 	}