diff --git a/ruby.yaml b/ruby.yaml
index 829cde5..52d2292 100644
--- a/ruby.yaml
+++ b/ruby.yaml
@@ -18,9 +18,11 @@ data:
         tracker: https://bugs.ruby-lang.org/
     dependencies:
         - buildrequires:
-            platform: []
+            # platform: [] is recommended.
+            # But set "-f28" to avoid the build failure as a temporary workflow.
+            platform: [-f28]
           requires:
-            platform: []
+            platform: [-f28]
     components:
         # SRPMs
         rpms: