diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dae674020..d8cff8e87 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -199,7 +199,7 @@ jobs:
           docker run --rm -w /srs/trunk/3rdparty/srs-bench srs:test \
             ./objs/srs_blackbox_test -test.v -test.run '^TestFast' -test.parallel 64
           docker run --rm -w /srs/trunk/3rdparty/srs-bench srs:test \
-            ./objs/srs_blackbox_test -test.v -test.run '^TestSlow' -test.parallel 2
+            ./objs/srs_blackbox_test -test.v -test.run '^TestSlow' -test.parallel 4
     runs-on: ubuntu-20.04
 
   coverage:
diff --git a/trunk/3rdparty/srs-bench/blackbox/hevc_test.go b/trunk/3rdparty/srs-bench/blackbox/hevc_test.go
index 8e66526ae..e313d19ef 100644
--- a/trunk/3rdparty/srs-bench/blackbox/hevc_test.go
+++ b/trunk/3rdparty/srs-bench/blackbox/hevc_test.go
@@ -379,7 +379,7 @@ func TestSlow_RtmpPublish_HlsPlay_HEVC_Basic(t *testing.T) {
 	ffprobe := NewFFprobe(func(v *ffprobeClient) {
 		v.dvrFile = path.Join(svr.WorkDir(), "objs", fmt.Sprintf("srs-ffprobe-%v.ts", streamID))
 		v.streamURL = fmt.Sprintf("http://localhost:%v/live/%v.m3u8", svr.HTTPPort(), streamID)
-		v.duration, v.timeout = duration, time.Duration(*srsFFprobeTimeout)*time.Millisecond * 2
+		v.duration, v.timeout = duration, time.Duration(*srsFFprobeTimeout)*time.Millisecond*2
 	})
 	wg.Add(1)
 	go func() {