diff --git a/components/esp_modem/examples/pppos_client/main/Kconfig.projbuild b/components/esp_modem/examples/pppos_client/main/Kconfig.projbuild
index 2bb3e4c55..836d94c03 100644
--- a/components/esp_modem/examples/pppos_client/main/Kconfig.projbuild
+++ b/components/esp_modem/examples/pppos_client/main/Kconfig.projbuild
@@ -185,7 +185,7 @@ menu "Example Configuration"
 
     config EXAMPLE_MQTT_BROKER_URI
         string "MQTT Broker URL"
-        default "mqtt://mqtt.eclipseprojects.io"
+        default "mqtt://test.mosquitto.org"
         help
             URL of the mqtt broker which this example connects to.
 
diff --git a/components/esp_modem/examples/simple_cmux_client/sdkconfig.ci.sim800_cmux b/components/esp_modem/examples/simple_cmux_client/sdkconfig.ci.sim800_cmux
index 6a22a89f1..7154d2fc3 100644
--- a/components/esp_modem/examples/simple_cmux_client/sdkconfig.ci.sim800_cmux
+++ b/components/esp_modem/examples/simple_cmux_client/sdkconfig.ci.sim800_cmux
@@ -16,4 +16,4 @@ CONFIG_COMPILER_CXX_EXCEPTIONS=y
 CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192
 CONFIG_EXAMPLE_CLOSE_CMUX_AT_END=y
 CONFIG_EXAMPLE_MQTT_TEST_TOPIC="/ci/esp-modem/pppos-client"
-CONFIG_BROKER_URI="mqtt://mqtt.eclipseprojects.io"
+CONFIG_BROKER_URI="mqtt://test.mosquitto.org"