diff --git a/spatialprofilingtoolbox/apiserver/app/main.py b/spatialprofilingtoolbox/apiserver/app/main.py
index 99f7a1dd7..0ea60ac0c 100644
--- a/spatialprofilingtoolbox/apiserver/app/main.py
+++ b/spatialprofilingtoolbox/apiserver/app/main.py
@@ -543,4 +543,5 @@ async def importance_fraction_plot(
     buffer = BytesIO()
     buffer.write(raw)
     buffer.seek(0)
-    return StreamingResponse(buffer, media_type=f"image/{img_format}")
+    media_type = "image/svg+xml" if img_format == "svg" else "image/png"
+    return StreamingResponse(buffer, media_type=media_type)
diff --git a/version.txt b/version.txt
index 81566e4e2..022a03374 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-0.27.0
\ No newline at end of file
+0.28.0
\ No newline at end of file