diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1b9d3a6..cc39368 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,3 +18,4 @@ repos:
         args: ["--", "-Dwarnings"]
       - id: cargo-test
       - id: cargo-fmt
+        exclude: video_player_mpv/
diff --git a/delfin/src/video_player/backends/mod.rs b/delfin/src/video_player/backends/mod.rs
index 58ee094..581ba88 100644
--- a/delfin/src/video_player/backends/mod.rs
+++ b/delfin/src/video_player/backends/mod.rs
@@ -95,6 +95,9 @@ pub trait VideoPlayerBackend: fmt::Debug {
     /// Set the current audio track.
     fn set_audio_track(&self, audio_track_id: Option<usize>);
 
+    /// Set Subtitle scale.
+    fn set_subtitle_scale(&self, subtitle_scale: f64);
+
     /// Get notified when video player reaches the end of the current video.
     fn connect_end_of_stream(&mut self, callback: Box<dyn Fn() + Send + 'static>);
 
diff --git a/delfin/src/video_player/backends/mpv.rs b/delfin/src/video_player/backends/mpv.rs
index d19fdd8..e203ba0 100644
--- a/delfin/src/video_player/backends/mpv.rs
+++ b/delfin/src/video_player/backends/mpv.rs
@@ -208,6 +208,10 @@ impl VideoPlayerBackend for VideoPlayerBackendMpv {
             .set_audio_track(audio_track_id.map(|id| id as u32).unwrap_or(0));
     }
 
+    fn set_subtitle_scale(&self, subtitle_scale: f64) {
+        self.widget.set_subtitle_scale(subtitle_scale);
+    }
+
     fn disconnect_signal_handler(&mut self, id: &Uuid) {
         match self.signal_handler_ids.remove(id) {
             Some(signal_handler_id) => {
diff --git a/video_player_mpv/src/auto/versions.txt b/video_player_mpv/src/auto/versions.txt
index 3fcc0d0..44a9254 100644
--- a/video_player_mpv/src/auto/versions.txt
+++ b/video_player_mpv/src/auto/versions.txt
@@ -1,3 +1,3 @@
 Generated by gir (https://github.com/gtk-rs/gir @ 428c880ecf0b)
-from sys/build (@ 6aaf92b050cd)
+from sys/build (@ c9cffe18b7d6)
 from sys/gir-files (@ 20031a537e40)
diff --git a/video_player_mpv/src/auto/video_player_mpv.rs b/video_player_mpv/src/auto/video_player_mpv.rs
index 251548a..7c0839b 100644
--- a/video_player_mpv/src/auto/video_player_mpv.rs
+++ b/video_player_mpv/src/auto/video_player_mpv.rs
@@ -111,6 +111,13 @@ impl VideoPlayerMpv {
         }
     }
 
+    #[doc(alias = "vpm_video_player_mpv_set_subtitle_scale")]
+    pub fn set_subtitle_scale(&self, subtitle_scale: f64) {
+        unsafe {
+            ffi::vpm_video_player_mpv_set_subtitle_scale(self.to_glib_none().0, subtitle_scale);
+        }
+    }
+
     #[doc(alias = "vpm_video_player_mpv_set_subtitle_track")]
     pub fn set_subtitle_track(&self, subtitle_track_id: u32) {
         unsafe {
diff --git a/video_player_mpv/sys/build/Vpm-0.0.gir b/video_player_mpv/sys/build/Vpm-0.0.gir
index ac0f848..2ff0bb5 100644
--- a/video_player_mpv/sys/build/Vpm-0.0.gir
+++ b/video_player_mpv/sys/build/Vpm-0.0.gir
@@ -378,6 +378,22 @@ and/or use gtk-doc annotations.  -->
           </parameter>
         </parameters>
       </method>
+      <method name="set_subtitle_scale"
+              c:identifier="vpm_video_player_mpv_set_subtitle_scale">
+        <source-position filename="video-player-mpv/video-player-mpv.h"
+                         line="39"/>
+        <return-value transfer-ownership="none">
+          <type name="none" c:type="void"/>
+        </return-value>
+        <parameters>
+          <instance-parameter name="self" transfer-ownership="none">
+            <type name="VideoPlayerMpv" c:type="VpmVideoPlayerMpv*"/>
+          </instance-parameter>
+          <parameter name="subtitle_scale" transfer-ownership="none">
+            <type name="gdouble" c:type="double"/>
+          </parameter>
+        </parameters>
+      </method>
       <method name="set_subtitle_track"
               c:identifier="vpm_video_player_mpv_set_subtitle_track">
         <source-position filename="video-player-mpv/video-player-mpv.h"
diff --git a/video_player_mpv/sys/src/auto/versions.txt b/video_player_mpv/sys/src/auto/versions.txt
index f34b5c7..3b07155 100644
--- a/video_player_mpv/sys/src/auto/versions.txt
+++ b/video_player_mpv/sys/src/auto/versions.txt
@@ -1,3 +1,3 @@
 Generated by gir (https://github.com/gtk-rs/gir @ 428c880ecf0b)
-from build (@ 6aaf92b050cd)
+from build (@ 26518e04b345)
 from gir-files (@ 20031a537e40)
diff --git a/video_player_mpv/sys/src/lib.rs b/video_player_mpv/sys/src/lib.rs
index ac5dab6..226d2dd 100644
--- a/video_player_mpv/sys/src/lib.rs
+++ b/video_player_mpv/sys/src/lib.rs
@@ -136,6 +136,10 @@ extern "C" {
         audio_track_id: c_uint,
     );
     pub fn vpm_video_player_mpv_set_mute(self_: *mut VpmVideoPlayerMpv, mute: bool);
+    pub fn vpm_video_player_mpv_set_subtitle_scale(
+        self_: *mut VpmVideoPlayerMpv,
+        subtitle_scale: c_double,
+    );
     pub fn vpm_video_player_mpv_set_subtitle_track(
         self_: *mut VpmVideoPlayerMpv,
         subtitle_track_id: c_uint,
diff --git a/video_player_mpv/sys/video-player-mpv/video-player-mpv.c b/video_player_mpv/sys/video-player-mpv/video-player-mpv.c
index 31b4818..71f6fd0 100644
--- a/video_player_mpv/sys/video-player-mpv/video-player-mpv.c
+++ b/video_player_mpv/sys/video-player-mpv/video-player-mpv.c
@@ -460,3 +460,9 @@ void vpm_video_player_mpv_set_subtitle_track(VpmVideoPlayerMpv *self,
   uint64_t id = (uint64_t)subtitle_track_id;
   mpv_set_property(self->mpv_ctx->handle, "sid", MPV_FORMAT_INT64, &id);
 }
+
+void vpm_video_player_mpv_set_subtitle_scale(VpmVideoPlayerMpv *self,
+                                             double subtitle_scale) {
+  mpv_set_option(self->mpv_ctx->handle, "sub-scale", MPV_FORMAT_DOUBLE,
+                 &subtitle_scale);
+}
diff --git a/video_player_mpv/sys/video-player-mpv/video-player-mpv.h b/video_player_mpv/sys/video-player-mpv/video-player-mpv.h
index 222c38d..f67233e 100644
--- a/video_player_mpv/sys/video-player-mpv/video-player-mpv.h
+++ b/video_player_mpv/sys/video-player-mpv/video-player-mpv.h
@@ -36,4 +36,7 @@ int vpm_video_player_mpv_current_subtitle_track(VpmVideoPlayerMpv *self);
 void vpm_video_player_mpv_set_subtitle_track(VpmVideoPlayerMpv *self,
                                              uint subtitle_track_id);
 
+void vpm_video_player_mpv_set_subtitle_scale(VpmVideoPlayerMpv *self,
+                                             double subtitle_scale);
+
 G_END_DECLS