diff --git a/arkbox.resource.json b/arkbox.resource.json
index 6cb692b..b94511b 100644
--- a/arkbox.resource.json
+++ b/arkbox.resource.json
@@ -16,7 +16,7 @@
           "type": "video",
           "lang": "en",
           "path": "resources/v2026.01/en/trainingdemo.mp4",
-          "thumbnail": "resources/v2026.01/en/cover.jpeg"
+          "thumbnail": "resources/v2026.01/en/cover.png"
         },
         {
           "id": "training-videos.demo2",
@@ -24,7 +24,7 @@
           "type": "video",
           "lang": "hi",
           "path": "resources/v2026.01/hi/trainingdemo2.mp4",
-          "thumbnail": "resources/v2026.01/hi/cover.jpeg"
+          "thumbnail": "resources/v2026.01/hi/cover.png"
         }
       ]
     }