diff --git a/project/ble_peripheral/ble_app_bladder_patch/main.c b/project/ble_peripheral/ble_app_bladder_patch/main.c
index bf1b5b2..d7eb395 100644
--- a/project/ble_peripheral/ble_app_bladder_patch/main.c
+++ b/project/ble_peripheral/ble_app_bladder_patch/main.c
@@ -148,29 +148,6 @@
 #define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000)            /* Subsequent param update interval: 30s */
 #define MAX_CONN_PARAMS_UPDATE_COUNT    3                                 /* Max param update attempts */
 
-/* -- BLE security parameters (when FEATURE_SECURE_CONNECTION enabled) --
- * Bonding (BOND=1): store pairing info in flash for reconnection
- * MITM protection (MITM=1): prevent man-in-the-middle attacks (passkey auth required)
- * LESC: disabled(0) in static passkey mode, enabled(1) in dynamic passkey mode
- * IO capabilities: DISPLAY_ONLY -> device displays passkey, user enters in app
- */
-#if FEATURE_SECURE_CONNECTION
-#define LESC_DEBUG_MODE                 0       /* LESC debug mode disabled */
-#define SEC_PARAM_BOND                  1       /* Bonding enabled (store pairing info) */
-#define SEC_PARAM_MITM                  1       /* MITM protection enabled */
-#if FEATURE_STATIC_PASSKEY
-#define SEC_PARAM_LESC                  0       /* Static passkey mode: LESC disabled */
-#else
-#define SEC_PARAM_LESC                  1       /* Dynamic passkey mode: LESC enabled */
-#endif
-#define SEC_PARAM_KEYPRESS              0       /* Keypress notification disabled */
-#define SEC_PARAM_IO_CAPABILITIES       BLE_GAP_IO_CAPS_DISPLAY_ONLY  /* Display only */
-#define SEC_PARAM_OOB                   0       /* No OOB (Out-of-Band) data */
-#define SEC_PARAM_MIN_KEY_SIZE          7       /* Min encryption key size (bytes) */
-#define SEC_PARAM_MAX_KEY_SIZE          16      /* Max encryption key size (bytes) */
-#define PASSKEY_TXT_LENGTH              8       /* Passkey text buffer length */
-#endif
-
 /*==============================================================================
  * System Constants
  *============================================================================*/