diff --git a/README.md b/README.md
index 06775473c..221564d61 100755
--- a/README.md
+++ b/README.md
@@ -159,6 +159,7 @@ For previous versions, please read:
 
 ## V4 changes
 
+* v4.0, 2020-08-18, RTC: DTLS support ARQ, covered with utest. 4.0.39
 * v4.0, 2020-08-06, RTC: Refine error check. 4.0.37
 * v4.0, 2020-07-25, RTC: Support multiple address for client. 4.0.36
 * v4.0, 2020-07-11, Refine log context with random string. 4.0.35
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 71356be0b..bdc884573 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 38
+#define SRS_VERSION4_REVISION 39
 
 #endif