diff --git a/README.md b/README.md
index 3e25a39f4..073016ef0 100755
--- a/README.md
+++ b/README.md
@@ -159,6 +159,7 @@ For previous versions, please read:
 
 ## V4 changes
 
+* v4.0, 2020-05-21, For [#307][bug #307], disable GSO and sendmmsg. 4.0.27
 * v4.0, 2020-05-14, For [#307][bug #307], refine core structure, RTMP base on frame, RTC base on RTP. 4.0.26
 * v4.0, 2020-05-11, For [#307][bug #307], refine RTC publisher structure. 4.0.25
 * v4.0, 2020-04-30, For [#307][bug #307], support publish RTC with passing opus. 4.0.24
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 55033b466..bbe3e2dd0 100644
--- a/trunk/src/core/srs_core_version4.hpp
+++ b/trunk/src/core/srs_core_version4.hpp
@@ -24,6 +24,6 @@
 #ifndef SRS_CORE_VERSION4_HPP
 #define SRS_CORE_VERSION4_HPP
 
-#define SRS_VERSION4_REVISION 26
+#define SRS_VERSION4_REVISION 27
 
 #endif