diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 307de2b..5518cd2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -88,4 +88,4 @@ jobs:
                 }
               }
             }
-          mediaType: "{\"previews\": [\"packages\"]}"
+          mediaType: '{"previews": ["packages"]}'