diff --git a/README.md b/README.md
index 2360de420..a24ff963f 100755
--- a/README.md
+++ b/README.md
@@ -155,6 +155,7 @@ For previous versions, please read:
 
 ## V4 changes
 
+* v4.0, 2021-01-31, Enable -std=c++11 by default. 4.0.65
 * v4.0, 2021-01-25, Enable --nasm and --srtp-asm by default for performance. 4.0.64
 * v4.0, 2021-01-20, Support HTTP-FLV and HLS for srs-player by H5. 4.0.63
 * v4.0, 2021-01-08, HTML5 video tag resolution adaptive. 4.0.59
diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 5d83ebfaa..23aab3509 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -19,7 +19,7 @@ SRS_HDS=NO
 SRS_SRT=NO
 SRS_RTC=YES
 SRS_GB28181=NO
-SRS_CXX11=NO
+SRS_CXX11=YES
 SRS_CXX14=NO
 SRS_NGINX=NO
 SRS_LIBRTMP=NO
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index bf107fccc..c50b667a2 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 64
+#define SRS_VERSION4_REVISION 65
 
 #endif