diff --git a/dvc/render/convert.py b/dvc/render/convert.py
index de78728c6..84b330ab8 100644
--- a/dvc/render/convert.py
+++ b/dvc/render/convert.py
@@ -60,7 +60,7 @@ def to_json(renderer, split: bool = False) -> List[Dict]:
         return [
             {
                 TYPE_KEY: renderer.TYPE,
-                REVISIONS_KEY: datapoint.get(REVISION_FIELD),
+                REVISIONS_KEY: [datapoint.get(REVISION_FIELD)],
                 "url": datapoint.get(SRC_FIELD),
             }
             for datapoint in renderer.datapoints
diff --git a/tests/unit/render/test_convert.py b/tests/unit/render/test_convert.py
index 077a86c7c..8f91d6d1f 100644
--- a/tests/unit/render/test_convert.py
+++ b/tests/unit/render/test_convert.py
@@ -214,6 +214,6 @@ def test_to_json_image(mocker):
     result = to_json(image_renderer)
     assert result[0] == {
         "url": image_renderer.datapoints[0].get(SRC_FIELD),
-        REVISIONS_KEY: image_renderer.datapoints[0].get(REVISION_FIELD),
+        REVISIONS_KEY: [image_renderer.datapoints[0].get(REVISION_FIELD)],
         TYPE_KEY: image_renderer.TYPE,
     }