diff --git a/README.md b/README.md
index d6c7c77fd..a551ea128 100755
--- a/README.md
+++ b/README.md
@@ -137,6 +137,8 @@ Other important wiki:
 
 ## V3 changes
 
+* <strong>v3.0, 2021-06-26, [3.0 release6(3.0.163)](https://github.com/ossrs/srs/releases/tag/v3.0-r6) released. 123011 lines.</strong>
+* v3.0, 2021-06-26, For [#2424](https://github.com/ossrs/srs/issues/2424), query the latest available version. 3.0.163
 * v3.0, 2021-05-12, Fix [#2311][bug #2311], Copy the request for stat client. 3.0.162
 * <strong>v3.0, 2021-04-28, [3.0 release5(3.0.161)][r3.0r5] released. 122750 lines.</strong>
 * v3.0, 2021-04-28, Upgrade players. 3.0.161
@@ -340,6 +342,8 @@ Other important wiki:
 
 ## V2 changes
 
+* <strong>v2.0, 2021-06-26, [2.0 release9(2.0.273)](https://github.com/ossrs/srs/releases/tag/v2.0-r9) released. 87552 lines.</strong>
+* v2.0, 2021-06-25, For [#2424](https://github.com/ossrs/srs/issues/2424), query the latest available version. 2.0.273
 * <strong>v2.0, 2020-01-25, [2.0 release8(2.0.272)][r2.0r8] released. 87292 lines.</strong>
 * v2.0, 2020-01-08, Merge [#1554][bug #1554], support logrotate copytruncate. 2.0.272
 * v2.0, 2020-01-05, Merge [#1551][bug #1551], fix memory leak in RTSP stack. 2.0.270
@@ -778,6 +782,7 @@ Other important wiki:
 
 ## Releases
 
+* 2021-06-26, [Release v3.0-r6](https://github.com/ossrs/srs/releases/tag/v3.0-r6), 3.0 release6, 3.0.163, 123011 lines.
 * 2021-04-28, [Release v3.0-r5][r3.0r5], 3.0 release5, 3.0.161, 122750 lines.
 * 2021-04-24, [Release v3.0-r4][r3.0r4], 3.0 release4, 3.0.160, 122750 lines.
 * 2021-01-02, [Release v3.0-r3][r3.0r3], 3.0 release3, 3.0.156, 122736 lines.
diff --git a/trunk/conf/full.conf b/trunk/conf/full.conf
index 74f62d4c6..8e8d15270 100644
--- a/trunk/conf/full.conf
+++ b/trunk/conf/full.conf
@@ -105,6 +105,11 @@ inotify_auto_reload off;
 # default: on
 auto_reload_for_docker on;
 
+# Query the latest available version of SRS, write a log to notice user to upgrade.
+# @see https://github.com/ossrs/srs/issues/2424
+# Default: on
+query_latest_version on;
+
 #############################################################################################
 # heartbeat/stats sections
 #############################################################################################
diff --git a/trunk/configure b/trunk/configure
index d1196dd36..04644562c 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -228,7 +228,7 @@ if [ $SRS_EXPORT_LIBRTMP_PROJECT = NO ]; then
             "srs_app_heartbeat" "srs_app_empty" "srs_app_http_client" "srs_app_http_static"
             "srs_app_recv_thread" "srs_app_security" "srs_app_statistic" "srs_app_hds"
             "srs_app_mpegts_udp" "srs_app_rtsp" "srs_app_listener" "srs_app_async_call"
-            "srs_app_caster_flv" "srs_app_process" "srs_app_ng_exec"
+            "srs_app_caster_flv" "srs_app_latest_version" "srs_app_process" "srs_app_ng_exec"
             "srs_app_hourglass" "srs_app_dash" "srs_app_fragment" "srs_app_dvr"
             "srs_app_coworkers")
     DEFINES=""
diff --git a/trunk/src/app/srs_app_config.cpp b/trunk/src/app/srs_app_config.cpp
index 56fefb336..9ff560d3c 100644
--- a/trunk/src/app/srs_app_config.cpp
+++ b/trunk/src/app/srs_app_config.cpp
@@ -4056,6 +4056,18 @@ bool SrsConfig::get_asprocess()
     return SRS_CONF_PERFER_FALSE(conf->arg0());
 }
 
+bool SrsConfig::whether_query_latest_version()
+{
+    static bool DEFAULT = true;
+
+    SrsConfDirective* conf = root->get("query_latest_version");
+    if (!conf) {
+        return DEFAULT;
+    }
+
+    return SRS_CONF_PERFER_TRUE(conf->arg0());
+}
+
 bool SrsConfig::empty_ip_ok()
 {
     static bool DEFAULT = true;
diff --git a/trunk/src/app/srs_app_config.hpp b/trunk/src/app/srs_app_config.hpp
index d0e6f2928..0788e5a34 100644
--- a/trunk/src/app/srs_app_config.hpp
+++ b/trunk/src/app/srs_app_config.hpp
@@ -468,6 +468,8 @@ public:
     virtual std::string get_work_dir();
     // Whether use asprocess mode.
     virtual bool get_asprocess();
+    // Whether query the latest available version of SRS.
+    virtual bool whether_query_latest_version();
     // Whether empty client IP is ok.
     virtual bool empty_ip_ok();
     // Get the start wait in ms for gracefully quit.
diff --git a/trunk/src/app/srs_app_latest_version.cpp b/trunk/src/app/srs_app_latest_version.cpp
new file mode 100644
index 000000000..656e3418c
--- /dev/null
+++ b/trunk/src/app/srs_app_latest_version.cpp
@@ -0,0 +1,166 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2015 SRS(ossrs)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <srs_app_latest_version.hpp>
+
+#include <srs_core_autofree.hpp>
+#include <srs_kernel_error.hpp>
+#include <srs_kernel_log.hpp>
+#include <srs_kernel_utility.hpp>
+#include <srs_protocol_json.hpp>
+#include <srs_protocol_utility.hpp>
+#include <srs_app_config.hpp>
+#include <srs_app_http_conn.hpp>
+#include <srs_app_http_client.hpp>
+#include <srs_app_utility.hpp>
+
+#include <unistd.h>
+#include <sstream>
+using namespace std;
+
+SrsLatestVersion::SrsLatestVersion()
+{
+    trd_ = new SrsSTCoroutine("signal", this);
+}
+
+SrsLatestVersion::~SrsLatestVersion()
+{
+    srs_freep(trd_);
+}
+
+srs_error_t SrsLatestVersion::start()
+{
+    if (!_srs_config->whether_query_latest_version()) {
+        return srs_success;
+    }
+
+    char buf[10];
+    srs_random_generate(buf, sizeof(buf));
+    for (int i = 0; i < (int)sizeof(buf); i++) {
+        buf[i] = 'a' + uint8_t(buf[i])%25;
+    }
+    server_id_ = string(buf, sizeof(buf));
+
+    return trd_->start();
+}
+
+srs_error_t SrsLatestVersion::cycle()
+{
+    srs_error_t err = srs_success;
+
+    srs_utime_t starttime = srs_update_system_time();
+    if ((err = query_latest_version()) != srs_success) {
+        srs_warn("query err %s", srs_error_desc(err).c_str());
+        srs_freep(err); // Ignore any error.
+    }
+
+    srs_utime_t first_random_wait = 0;
+    srs_random_generate((char*)&first_random_wait, 8);
+    first_random_wait = srs_utime_t(uint64_t((first_random_wait + starttime + getpid())) % (60 * 60)) * SRS_UTIME_SECONDS; // in s.
+
+    srs_trace("Startup query id=%s, eip=%s, match=%s, stable=%s, wait=%ds, cost=%dms", server_id_.c_str(), srs_get_public_internet_address().c_str(), match_version_.c_str(), stable_version_.c_str(), srsu2msi(first_random_wait)/1000, srsu2msi(srs_update_system_time() - starttime));
+    srs_usleep(first_random_wait);
+
+    while (true) {
+        starttime = srs_update_system_time();
+        if ((err = query_latest_version()) != srs_success) {
+            srs_warn("query err %s", srs_error_desc(err).c_str());
+            srs_freep(err); // Ignore any error.
+        }
+
+        srs_trace("Finish query id=%s, eip=%s, match=%s, stable=%s, cost=%dms", server_id_.c_str(), srs_get_public_internet_address().c_str(), match_version_.c_str(), stable_version_.c_str(), srsu2msi(srs_update_system_time() - starttime));
+        srs_usleep(3600 * SRS_UTIME_SECONDS); // Every an hour.
+    }
+
+    return err;
+}
+
+srs_error_t SrsLatestVersion::query_latest_version()
+{
+    srs_error_t err = srs_success;
+
+    // Generate uri and parse to object.
+    stringstream ss;
+    ss << "http://api.ossrs.net/service/v1/releases?"
+          << "version=v" << VERSION_MAJOR << "." << VERSION_MINOR << "." << VERSION_REVISION
+          << "&id=" << server_id_
+          << "&eip=" << srs_get_public_internet_address()
+          << "&ts=" << srsu2ms(srs_get_system_time());
+    string url = ss.str();
+
+    SrsHttpUri uri;
+    if ((err = uri.initialize(url)) != srs_success) {
+        return srs_error_wrap(err, "http: post failed. url=%s", url.c_str());
+    }
+
+    // Start HTTP request and read response.
+    SrsHttpClient http;
+    if ((err = http.initialize(uri.get_host(), uri.get_port())) != srs_success) {
+        return err;
+    }
+
+    ISrsHttpMessage* msg = NULL;
+    if ((err = http.get(uri.get_path(), "", &msg)) != srs_success) {
+        return err;
+    }
+    SrsAutoFree(ISrsHttpMessage, msg);
+
+    string res;
+    int code = msg->status_code();
+    if ((err = msg->body_read_all(res)) != srs_success) {
+        return err;
+    }
+
+    // Check the response code and content.
+    if (code != SRS_CONSTS_HTTP_OK) {
+        return srs_error_new(ERROR_HTTP_STATUS_INVALID, "invalid response status=%d", code);
+    }
+
+    if (res.empty()) {
+        return srs_error_new(ERROR_HTTP_DATA_INVALID, "invalid empty response");
+    }
+
+    // Response in json object.
+    SrsJsonAny* jres = SrsJsonAny::loads((char*)res.c_str());
+    if (!jres || !jres->is_object()) {
+        return srs_error_new(ERROR_HTTP_DATA_INVALID, "invalid response %s", res.c_str());
+    }
+    SrsAutoFree(SrsJsonAny, jres);
+
+    SrsJsonObject* obj = jres->to_object();
+    SrsJsonAny* prop = NULL;
+
+    // Parse fields of response.
+    if ((prop = obj->ensure_property_string("match_version")) == NULL) {
+        return srs_error_new(ERROR_RESPONSE_CODE, "no match_version");
+    }
+    match_version_ = prop->to_str();
+
+    if ((prop = obj->ensure_property_string("stable_version")) == NULL) {
+        return srs_error_new(ERROR_RESPONSE_CODE, "no stable_version");
+    }
+    stable_version_ = prop->to_str();
+
+    return err;
+}
+
diff --git a/trunk/src/app/srs_app_latest_version.hpp b/trunk/src/app/srs_app_latest_version.hpp
new file mode 100644
index 000000000..50ade4290
--- /dev/null
+++ b/trunk/src/app/srs_app_latest_version.hpp
@@ -0,0 +1,58 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2015 SRS(ossrs)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef SRS_APP_LATEST_VERSION_HPP
+#define SRS_APP_LATEST_VERSION_HPP
+
+/*
+#include <srs_app_latest_version.hpp>
+*/
+
+#include <srs_core.hpp>
+
+#include <srs_app_thread.hpp>
+
+#include <string>
+
+class SrsLatestVersion : public ISrsCoroutineHandler
+{
+private:
+    SrsCoroutine* trd_;
+    std::string server_id_;
+private:
+    std::string match_version_;
+    std::string stable_version_;
+public:
+    SrsLatestVersion();
+    virtual ~SrsLatestVersion();
+public:
+    virtual srs_error_t start();
+// interface ISrsEndlessThreadHandler.
+public:
+    virtual srs_error_t cycle();
+private:
+    srs_error_t query_latest_version();
+};
+
+#endif
+
diff --git a/trunk/src/app/srs_app_server.cpp b/trunk/src/app/srs_app_server.cpp
index 971b771c0..11fe8116d 100644
--- a/trunk/src/app/srs_app_server.cpp
+++ b/trunk/src/app/srs_app_server.cpp
@@ -54,6 +54,7 @@ using namespace std;
 #include <srs_kernel_consts.hpp>
 #include <srs_app_thread.hpp>
 #include <srs_app_coworkers.hpp>
+#include <srs_app_latest_version.hpp>
 
 // system interval in srs_utime_t,
 // all resolution times should be times togother,
@@ -623,6 +624,7 @@ SrsServer::SrsServer()
     pid_fd = -1;
     
     signal_manager = new SrsSignalManager(this);
+    latest_version_ = new SrsLatestVersion();
     conn_manager = new SrsCoroutineManager();
     
     handler = NULL;
@@ -659,6 +661,7 @@ void SrsServer::destroy()
     }
     
     srs_freep(signal_manager);
+    srs_freep(latest_version_);
     srs_freep(conn_manager);
 }
 
@@ -787,7 +790,18 @@ srs_error_t SrsServer::initialize_st()
 
 srs_error_t SrsServer::initialize_signal()
 {
-    return signal_manager->initialize();
+    srs_error_t err = srs_success;
+
+    if ((err = signal_manager->initialize()) != srs_success) {
+        return srs_error_wrap(err, "init signal manager");
+    }
+
+    // Start the version query coroutine.
+    if ((err = latest_version_->start()) != srs_success) {
+        return srs_error_wrap(err, "start version query");
+    }
+
+    return err;
 }
 
 srs_error_t SrsServer::acquire_pid_file()
diff --git a/trunk/src/app/srs_app_server.hpp b/trunk/src/app/srs_app_server.hpp
index baeb7f4c5..5893055eb 100644
--- a/trunk/src/app/srs_app_server.hpp
+++ b/trunk/src/app/srs_app_server.hpp
@@ -51,6 +51,7 @@ class SrsUdpListener;
 class SrsTcpListener;
 class SrsAppCasterFlv;
 class SrsCoroutineManager;
+class SrsLatestVersion;
 
 // The listener type for server to identify the connection,
 // that is, use different type to process the connection.
@@ -239,6 +240,8 @@ private:
     std::vector<SrsListener*> listeners;
     // Signal manager which convert gignal to io message.
     SrsSignalManager* signal_manager;
+    // To query the latest available version of SRS.
+    SrsLatestVersion* latest_version_;
     // Handle in server cycle.
     ISrsServerCycle* handler;
     // User send the signal, convert to variable.
diff --git a/trunk/src/core/srs_core_version3.hpp b/trunk/src/core/srs_core_version3.hpp
index 9b683c37b..040006ced 100644
--- a/trunk/src/core/srs_core_version3.hpp
+++ b/trunk/src/core/srs_core_version3.hpp
@@ -24,6 +24,6 @@
 #ifndef SRS_CORE_VERSION3_HPP
 #define SRS_CORE_VERSION3_HPP
 
-#define SRS_VERSION3_REVISION 162
+#define SRS_VERSION3_REVISION 163
 
 #endif