diff --git a/README.md b/README.md
index 8d1a431a8..d186d8153 100755
--- a/README.md
+++ b/README.md
@@ -156,6 +156,7 @@ For previous versions, please read:
 
 ## V4 changes
 
+* v4.0, 2021-02-27, RTC: Support object cache pool. 4.0.75
 * v4.0, 2021-02-12, RTC: Support high performance timer about 25ms resolution. 4.0.72
 * v4.0, 2021-02-10, RTC: Refine performance about 700+ streams. 4.0.71
 * v4.0, 2021-02-08, RTC: Print stat for pli and timer every 5s. 4.0.70
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 3db4f439e..405bea09e 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 74
+#define SRS_VERSION4_REVISION 75
 
 #endif