diff --git a/README.md b/README.md
index cafee91e3..bd417fb8c 100755
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ A big THANK YOU goes to:
 
 ## Releases
 
-* 2021-10-12, Release [v4.0.176](https://github.com/ossrs/srs/releases/tag/v4.0.176), 4.0 dev6, v4.0.176, 143675 lines.
+* 2021-10-12, Release [v4.0.177](https://github.com/ossrs/srs/releases/tag/v4.0.177), 4.0 dev6, v4.0.177, 143686 lines.
 * 2021-09-05, Release [v4.0.161](https://github.com/ossrs/srs/releases/tag/v4.0.161), 4.0 dev5, v4.0.161, 145865 lines.
 * 2021-08-15, Release [v4.0.156](https://github.com/ossrs/srs/releases/tag/v4.0.156), 4.0 dev4, v4.0.156, 145490 lines.
 * 2021-08-14, Release [v4.0.153](https://github.com/ossrs/srs/releases/tag/v4.0.153), 4.0 dev3, v4.0.153, 145506 lines.
diff --git a/trunk/doc/CHANGELOG.md b/trunk/doc/CHANGELOG.md
index fba3b3737..d281c4a6c 100644
--- a/trunk/doc/CHANGELOG.md
+++ b/trunk/doc/CHANGELOG.md
@@ -8,6 +8,7 @@ The changelog for SRS.
 
 ## SRS 4.0 Changelog
 
+* v4.0, 2021-10-12, Merge [#2550](https://github.com/ossrs/srs/pull/2550): API use publish params. v4.0.177
 * v4.0, 2021-10-12, Merge [#2549](https://github.com/ossrs/srs/pull/2549): Fix duration issue for HLS on_hls. v4.0.176
 * v4.0, 2021-10-11, Fix [#1641](https://github.com/ossrs/srs/issues/1641), HLS/RTC picture corrupt for SPS/PPS lost. v4.0.175
 * v4.0, 2021-10-11, RTC: Refine config, aac to rtmp_to_rtc, bframe to keep_bframe. v4.0.174
diff --git a/trunk/src/app/srs_app_dvr.cpp b/trunk/src/app/srs_app_dvr.cpp
index c17ae6fc7..6a3932ca5 100644
--- a/trunk/src/app/srs_app_dvr.cpp
+++ b/trunk/src/app/srs_app_dvr.cpp
@@ -580,6 +580,7 @@ SrsDvrPlan::SrsDvrPlan()
 SrsDvrPlan::~SrsDvrPlan()
 {
     srs_freep(segment);
+    srs_freep(req);
 }
 
 srs_error_t SrsDvrPlan::initialize(SrsOriginHub* h, SrsDvrSegmenter* s, SrsRequest* r)
@@ -587,7 +588,7 @@ srs_error_t SrsDvrPlan::initialize(SrsOriginHub* h, SrsDvrSegmenter* s, SrsReque
     srs_error_t err = srs_success;
     
     hub = h;
-    req = r;
+    req = r->copy();
     segment = s;
     
     if ((err = segment->initialize(this, r)) != srs_success) {
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 013745cf5..be365e728 100644
--- a/trunk/src/core/srs_core_version4.hpp
+++ b/trunk/src/core/srs_core_version4.hpp
@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       4
 #define VERSION_MINOR       0
-#define VERSION_REVISION    176
+#define VERSION_REVISION    177
 
 #endif