diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfd05672c..973b1fedc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ The changelog for SRS.
 
 ## SRS 4.0 Changelog
 
+* v4.0, 2021-08-14, RTC: Merge [#2533](https://github.com/ossrs/srs/pull/2533), fix SDP comparison bug. 4.0.154
 * v4.0, 2021-08-13, RTC: Merge [#2526](https://github.com/ossrs/srs/pull/2526), fix codec issue for G.711 or H.263. 4.0.152
 * v4.0, 2021-08-10, RTC: Merge [#2509](https://github.com/ossrs/srs/pull/2514), support http hooks n_play/stop/publish/unpublish. 4.0.151
 * v4.0, 2021-08-07, Merge [#2514](https://github.com/ossrs/srs/pull/2514), Get original client ip instead of proxy ip, for rtc api #2514. 4.0.150
diff --git a/trunk/src/app/srs_app_rtc_sdp.cpp b/trunk/src/app/srs_app_rtc_sdp.cpp
index e9e549393..fbaa70111 100644
--- a/trunk/src/app/srs_app_rtc_sdp.cpp
+++ b/trunk/src/app/srs_app_rtc_sdp.cpp
@@ -145,7 +145,7 @@ srs_error_t SrsSessionInfo::encode(std::ostringstream& os)
     return err;
 }
 
-bool SrsSessionInfo::operator=(const SrsSessionInfo& rhs)
+bool SrsSessionInfo::operator==(const SrsSessionInfo& rhs)
 {
     return ice_ufrag_        == rhs.ice_ufrag_ &&
            ice_pwd_          == rhs.ice_pwd_ &&
@@ -155,6 +155,16 @@ bool SrsSessionInfo::operator=(const SrsSessionInfo& rhs)
            setup_            == rhs.setup_;
 }
 
+SrsSessionInfo &SrsSessionInfo::operator=(SrsSessionInfo other) {
+    std::swap(ice_ufrag_, other.ice_ufrag_);
+    std::swap(ice_pwd_, other.ice_pwd_);
+    std::swap(ice_options_, other.ice_options_);
+    std::swap(fingerprint_algo_, other.fingerprint_algo_);
+    std::swap(fingerprint_, other.fingerprint_);
+    std::swap(setup_, other.setup_);
+    return *this;
+}
+
 SrsSSRCInfo::SrsSSRCInfo()
 {
     ssrc_ = 0;
diff --git a/trunk/src/app/srs_app_rtc_sdp.hpp b/trunk/src/app/srs_app_rtc_sdp.hpp
index 4484bfdc8..52cff2656 100644
--- a/trunk/src/app/srs_app_rtc_sdp.hpp
+++ b/trunk/src/app/srs_app_rtc_sdp.hpp
@@ -36,7 +36,9 @@ public:
     srs_error_t parse_attribute(const std::string& attribute, const std::string& value);
     srs_error_t encode(std::ostringstream& os);
 
-    bool operator=(const SrsSessionInfo& rhs);
+    bool operator==(const SrsSessionInfo& rhs);
+    // user-defined copy assignment (copy-and-swap idiom)
+    SrsSessionInfo& operator=(SrsSessionInfo other);
 public:
     std::string ice_ufrag_;
     std::string ice_pwd_;
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index a68ea7de4..f55277c86 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    153
+#define VERSION_REVISION    154
 
 #endif