diff --git a/.gitignore b/.gitignore
index 7e778bb..2edd53a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,7 @@ CMakeUserPresets.json
 # build folder
 build/
 # End of https://www.toptal.com/developers/gitignore/api/cmake
+
+# Credentials
+include/credentials.h
+replacements.txt
diff --git a/src/main.c b/src/main.c
index 3eac4e3..f9abc99 100644
--- a/src/main.c
+++ b/src/main.c
@@ -18,12 +18,13 @@
  *               the readings to Adafruit IO over MQTT using the Pico W.
  ******************************************************************************/
 
+#include "credentials.h"
 #include "aht.h"
 #include "bmp.h"
 #include "ens.h"
-#include "mqtt.h"
 #include "hardware/gpio.h"
 #include "hardware/i2c.h"
+#include "mqtt.h"
 #include "pico/cyw43_arch.h"
 #include "pico/stdlib.h" // IWYU pragma: keep
 #include <boards/pico_w.h>
@@ -38,10 +39,7 @@
 #define I2C1_SDA_PIN 18
 // MQTT and WiFi defines
 #define ADAFRUIT_IO_HOST "io.adafruit.com"
-#define ADAFRUIT_IO_USERNAME "ADAFRUIT_IO_USERNAME"
-#define ADAFRUIT_IO_PASSWORD "ADAFRUIT_IO_KEY"
-#define WIFI_SSID "Meosjin"
-#define WIFI_PASSWORD "WIFI_PASSWORD"
+#define ADAFRUIT_IO_PASSWORD ADAFRUIT_IO_KEY
 #define MQTT_KEEP_ALIVE_SECONDS 60
 
 static void mqtt_connection_cb(mqtt_client_t *client, void *arg,
@@ -78,13 +76,14 @@ static uint16_t average_uint16(const uint16_t *samples, uint8_t count) {
 
 int main(void) {
   // MQTT Topics
-  static const char temp_topic[] = "ADAFRUIT_IO_USERNAME/feeds/ensaht.temperature";
-  static const char humi_topic[] = "ADAFRUIT_IO_USERNAME/feeds/ensaht.humidity";
-  static const char aqi_topic[] = "ADAFRUIT_IO_USERNAME/feeds/ensaht.aqi";
-  static const char tvoc_topic[] = "ADAFRUIT_IO_USERNAME/feeds/ensaht.tvoc";
-  static const char etoh_topic[] = "ADAFRUIT_IO_USERNAME/feeds/ensaht.etoh";
-  static const char eco2_topic[] = "ADAFRUIT_IO_USERNAME/feeds/ensaht.eco2";
-  static const char prs_topic[] = "ADAFRUIT_IO_USERNAME/feeds/ensaht.pressure";
+  static const char temp_topic[] =
+      ADAFRUIT_IO_USERNAME "/feeds/ensaht.temperature";
+  static const char humi_topic[] = ADAFRUIT_IO_USERNAME "/feeds/ensaht.humidity";
+  static const char aqi_topic[] = ADAFRUIT_IO_USERNAME "/feeds/ensaht.aqi";
+  static const char tvoc_topic[] = ADAFRUIT_IO_USERNAME "/feeds/ensaht.tvoc";
+  static const char etoh_topic[] = ADAFRUIT_IO_USERNAME "/feeds/ensaht.etoh";
+  static const char eco2_topic[] = ADAFRUIT_IO_USERNAME "/feeds/ensaht.eco2";
+  static const char prs_topic[] = ADAFRUIT_IO_USERNAME "/feeds/ensaht.pressure";
   uint16_t tvoc, eco2, etoh, avg_tvoc, avg_eco2, avg_etoh;
   uint8_t aqi, validData;
   double t, h, avg_t, avg_h, avg_bmp_t, avg_bmp_p;