diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b8b48a2..33f105e2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -35,6 +35,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Helm: Empty password for Redis (<https://github.com/opencv/cvat/pull/5520>)
+- Fixed HRNet serverless function runtime error on images with alpha channel (<https://github.com/opencv/cvat/pull/5570>)
 - Preview & chunk cache settings are ignored (<https://github.com/opencv/cvat/pull/5569>)
 
 ### Security
diff --git a/serverless/pytorch/saic-vul/hrnet/nuclio/main.py b/serverless/pytorch/saic-vul/hrnet/nuclio/main.py
index 3ac93ae5..2968ccf7 100644
--- a/serverless/pytorch/saic-vul/hrnet/nuclio/main.py
+++ b/serverless/pytorch/saic-vul/hrnet/nuclio/main.py
@@ -24,7 +24,7 @@ def handler(context, event):
     neg_points = data["neg_points"]
     threshold = data.get("threshold", 0.5)
     buf = io.BytesIO(base64.b64decode(data["image"]))
-    image = Image.open(buf)
+    image = Image.open(buf).convert('RGB')
 
     mask, polygon = context.user_data.model.handle(image, pos_points,
         neg_points, threshold)