diff --git a/README.md b/README.md
index 478b8d2d..812ea358 100644
--- a/README.md
+++ b/README.md
@@ -44,8 +44,6 @@ And to publish a message:
 
 ## To dynamically create/delete/show a bridge, use:
 
-  Set allow_sys_update with true value in mosquitto.conf file.
-
   Mosquitto broker implement SYS-Topics. All SYS-Topics start $SYS and are read-only for MQTT clients.
   To dynamically create or delete a bridge, mosquitto use new topics: BRIDGE-Topics.
   All BRIDGE-Topics start with $BRIDGE and are read-write with ACL Protection.
diff --git a/mosquitto.conf b/mosquitto.conf
index d485563f..216b8c7d 100644
--- a/mosquitto.conf
+++ b/mosquitto.conf
@@ -807,10 +807,6 @@
 # Set to 0 for "unlimited".
 #bridge_max_packet_size 0
 
-# If allow_sys_update is set to true, Mosquitto allows to interpret some $SYS
-# topics. Interpreted topics are : $BRIDGE/new and $BRIDGE/del.
-# They are used for dynamic bridges behaviour.
-#allow_sys_update true
 
 # -----------------------------------------------------------------
 # Certificate based SSL/TLS support
diff --git a/src/conf.c b/src/conf.c
index a054c450..d6918d30 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -146,7 +146,6 @@ static void config__init_reload(struct mosquitto__config *config)
 	config->security_options.allow_zero_length_clientid = true;
 	config->security_options.auto_id_prefix = NULL;
 	config->security_options.auto_id_prefix_len = 0;
-	config->allow_sys_update = false;
 
 	mosquitto__free(config->security_options.password_file);
 	config->security_options.password_file = NULL;
@@ -824,8 +823,6 @@ int config__read_file_core(struct mosquitto__config *config, bool reload, struct
 				}else if(!strcmp(token, "allow_zero_length_clientid")){
 					conf__set_cur_security_options(config, cur_listener, &cur_security_options);
 					if(conf__parse_bool(&token, "allow_zero_length_clientid", &cur_security_options->allow_zero_length_clientid, saveptr)) return MOSQ_ERR_INVAL;
-				}else if(!strcmp(token, "allow_sys_update")){
-					if(conf__parse_bool(&token, "allow_sys_update", &config->allow_sys_update, saveptr)) return MOSQ_ERR_INVAL;
 				}else if(!strncmp(token, "auth_opt_", strlen("auth_opt_")) || !strncmp(token, "plugin_opt_", strlen("plugin_opt_"))){
 					if(reload) continue; /* Auth plugin not currently valid for reloading. */
 					if(!cur_auth_plugin_config){
diff --git a/src/handle_publish.c b/src/handle_publish.c
index c98f557a..ba269a04 100644
--- a/src/handle_publish.c
+++ b/src/handle_publish.c
@@ -256,13 +256,11 @@ int handle__publish(struct mosquitto *context)
 
 	/* Check if demand concern bridge dynamic */
 	if(!strncmp(msg->topic, "$BRIDGE/", 8)){
-	  if(db.config->allow_sys_update){
 		  rc = bridge__dynamic_analyse(&db, msg->topic, msg->payload, msg->payloadlen);
 		  if(rc == MOSQ_ERR_BRIDGE_DYNA ){
 			  log__printf(NULL, MOSQ_LOG_DEBUG, "PUBLISH Invalid bridge dynamic configuration on $BRIDGE.");
 			  rc = 0; /* To not disturbe normal publish management */
 		  }
-	  }
 	}
 
 	if(!strncmp(msg->topic, "$CONTROL/", 9)){
diff --git a/src/mosquitto_broker_internal.h b/src/mosquitto_broker_internal.h
index 9d48fca3..2fe044b6 100644
--- a/src/mosquitto_broker_internal.h
+++ b/src/mosquitto_broker_internal.h
@@ -251,7 +251,6 @@ typedef struct mosquitto_plugin_id_t{
 
 struct mosquitto__config {
 	bool allow_duplicate_messages;
-	bool allow_sys_update;
 	int autosave_interval;
 	bool autosave_on_changes;
 	bool check_retain_source;
diff --git a/src/security.c b/src/security.c
index 6bef2b97..77fa865a 100644
--- a/src/security.c
+++ b/src/security.c
@@ -643,7 +643,7 @@ static int acl__check_single(struct mosquitto__auth_plugin_config *auth_plugin,
 }
 
 
-static int acl__check_dollar(struct mosquitto_db *db, const char *topic, int access)
+static int acl__check_dollar(const char *topic, int access)
 {
 	int rc;
 	bool match = false;
@@ -671,7 +671,6 @@ static int acl__check_dollar(struct mosquitto_db *db, const char *topic, int acc
 		}
 	}else if(!strncmp(topic, "$BRIDGE", 7)){
 		/* Check if demand concern bridge dynamic */
-		if(db->config->allow_sys_update){
 			if((strncmp("$BRIDGE/new",topic,11))==0){
 				log__printf(NULL, MOSQ_LOG_DEBUG, "Bridge New");
 				return MOSQ_ERR_SUCCESS;
@@ -680,7 +679,7 @@ static int acl__check_dollar(struct mosquitto_db *db, const char *topic, int acc
 				log__printf(NULL, MOSQ_LOG_DEBUG, "Bridge Del");
 				return MOSQ_ERR_SUCCESS;
 			}
-		} else { log__printf(NULL, MOSQ_LOG_DEBUG, "You must activate allow_sys_update"); }
+		}
 	}else{
 		/* This is an unknown $ topic, for the moment just defer to actual tests. */
 		log__printf(NULL, MOSQ_LOG_DEBUG, "Topic with $ forbidden");
@@ -705,7 +704,7 @@ int mosquitto_acl_check(struct mosquitto *context, const char *topic, uint32_t p
 		return MOSQ_ERR_SUCCESS;
 	}
 
-	rc = acl__check_dollar(&db, topic, access);
+	rc = acl__check_dollar(topic, access);
 	if(rc) return rc;
 
 	/*