diff --git a/esphome/components/mqtt/mqtt_component.cpp b/esphome/components/mqtt/mqtt_component.cpp
index 200f1f99a3..fe520bd175 100644
--- a/esphome/components/mqtt/mqtt_component.cpp
+++ b/esphome/components/mqtt/mqtt_component.cpp
@@ -154,8 +154,9 @@ bool MQTTComponent::send_discovery_() {
         device_info[MQTT_DEVICE_MANUFACTURER] =
             model == nullptr ? ESPHOME_PROJECT_NAME : std::string(ESPHOME_PROJECT_NAME, model - ESPHOME_PROJECT_NAME);
 #else
-        device_info[MQTT_DEVICE_SW_VERSION] =
-            str_sprintf(ESPHOME_VERSION " (config hash 0x%08" PRIx32 ")", App.get_config_hash());
+        char sw_version[64];
+        snprintf_P(sw_version, sizeof(sw_version), PSTR(ESPHOME_VERSION " (%08" PRIx32 ")"), App.get_config_hash());
+        device_info[MQTT_DEVICE_SW_VERSION] = sw_version;
         device_info[MQTT_DEVICE_MODEL] = ESPHOME_BOARD;
 #if defined(USE_ESP8266) || defined(USE_ESP32)
         device_info[MQTT_DEVICE_MANUFACTURER] = "Espressif";
diff --git a/esphome/components/version/version_text_sensor.cpp b/esphome/components/version/version_text_sensor.cpp
index f03c91e5f5..3b9d09d1e7 100644
--- a/esphome/components/version/version_text_sensor.cpp
+++ b/esphome/components/version/version_text_sensor.cpp
@@ -10,14 +10,16 @@ namespace version {
 static const char *const TAG = "version.text_sensor";
 
 void VersionTextSensor::setup() {
+  char version_str[128];
   if (this->hide_timestamp_) {
-    this->publish_state(str_sprintf(ESPHOME_VERSION " (config hash 0x%08" PRIx32 ")", App.get_config_hash()));
+    snprintf_P(version_str, sizeof(version_str), PSTR(ESPHOME_VERSION " (%08" PRIx32 ")"), App.get_config_hash());
   } else {
     char build_time_str[esphome::Application::BUILD_TIME_STR_SIZE];
     App.get_build_time_string(build_time_str);
-    this->publish_state(str_sprintf(ESPHOME_VERSION " (config hash 0x%08" PRIx32 ", built: %s)", App.get_config_hash(),
-                                    build_time_str));
+    snprintf_P(version_str, sizeof(version_str), PSTR(ESPHOME_VERSION " (%08" PRIx32 ", built: %s)"),
+               App.get_config_hash(), build_time_str);
   }
+  this->publish_state(version_str);
 }
 float VersionTextSensor::get_setup_priority() const { return setup_priority::DATA; }
 void VersionTextSensor::set_hide_timestamp(bool hide_timestamp) { this->hide_timestamp_ = hide_timestamp; }