diff --git a/Dockerfile b/Dockerfile
index 3038c76..9c34a81 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,8 +23,10 @@ RUN useradd --create-home --shell /bin/bash app
 WORKDIR /home/app
 USER app
 
-RUN uv tool install instaloader yt-dlp \
-    && instaloader --version \
+RUN uv tool install instaloader \
+    && instaloader --version
+
+RUN uv tool install yt-dlp \
     && yt-dlp --version
 
 COPY --from=builder /app/target/release/tg-relay-rs /usr/local/bin/tg-relay-rs
diff --git a/src/download.rs b/src/download.rs
index ba262de..f9a4bd5 100644
--- a/src/download.rs
+++ b/src/download.rs
@@ -93,6 +93,8 @@ pub async fn download_ytdlp(url: &str, format: &str) -> Result<DownloadResult> {
         "--no-playlist",
         "-f",
         format,
+        "--merge-output-format",
+        "mp4",
         "--restrict-filenames",
         "-o",
         "%(id)s.%(ext)s",
diff --git a/src/handlers/youtube.rs b/src/handlers/youtube.rs
index fae1ce6..770318f 100644
--- a/src/handlers/youtube.rs
+++ b/src/handlers/youtube.rs
@@ -44,8 +44,7 @@ impl SocialHandler for YouTubeShortsHandler {
 
     async fn handle(&self, bot: &Bot, chat_id: ChatId, url: String) -> Result<()> {
         info!(handler = %self.name(), url = %url, "handling youtube code");
-        let format = "bestvideo[ext=mp4]+bestaudio/best";
-        let dr = download_ytdlp(&url, format).await?;
+        let dr = download_ytdlp(&url, "best").await?;
         process_download_result(bot, chat_id, dr).await
     }