diff --git a/extmod/nimble/modbluetooth_nimble.c b/extmod/nimble/modbluetooth_nimble.c
index 6ac31fd4bd..125e282d0d 100644
--- a/extmod/nimble/modbluetooth_nimble.c
+++ b/extmod/nimble/modbluetooth_nimble.c
@@ -138,9 +138,9 @@ STATIC int ble_gattc_attr_write_cb(uint16_t conn_handle, const struct ble_gatt_e
 
 #if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
 // Bonding store.
-STATIC int ble_store_ram_read(int obj_type, const union ble_store_key *key, union ble_store_value *value);
-STATIC int ble_store_ram_write(int obj_type, const union ble_store_value *val);
-STATIC int ble_store_ram_delete(int obj_type, const union ble_store_key *key);
+STATIC int ble_secret_store_read(int obj_type, const union ble_store_key *key, union ble_store_value *value);
+STATIC int ble_secret_store_write(int obj_type, const union ble_store_value *val);
+STATIC int ble_secret_store_delete(int obj_type, const union ble_store_key *key);
 #endif
 
 STATIC int ble_hs_err_to_errno(int err) {
@@ -604,6 +604,12 @@ int mp_bluetooth_init(void) {
     ble_hs_cfg.gatts_register_cb = gatts_register_cb;
     ble_hs_cfg.store_status_cb = ble_store_util_status_rr;
 
+    #if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
+    ble_hs_cfg.store_read_cb = ble_secret_store_read;
+    ble_hs_cfg.store_write_cb = ble_secret_store_write;
+    ble_hs_cfg.store_delete_cb = ble_secret_store_delete;
+    #endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
+
     MP_STATE_PORT(bluetooth_nimble_root_pointers) = m_new0(mp_bluetooth_nimble_root_pointers_t, 1);
     mp_bluetooth_gatts_db_create(&MP_STATE_PORT(bluetooth_nimble_root_pointers)->gatts_db);
 
@@ -1826,8 +1832,8 @@ int mp_bluetooth_hci_cmd(uint16_t ogf, uint16_t ocf, const uint8_t *req, size_t
 
 #if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
 
-STATIC int ble_store_ram_read(int obj_type, const union ble_store_key *key, union ble_store_value *value) {
-    DEBUG_printf("ble_store_ram_read: %d\n", obj_type);
+STATIC int ble_secret_store_read(int obj_type, const union ble_store_key *key, union ble_store_value *value) {
+    DEBUG_printf("ble_secret_store_read: %d\n", obj_type);
     const uint8_t *key_data;
     size_t key_data_len;
 
@@ -1861,7 +1867,7 @@ STATIC int ble_store_ram_read(int obj_type, const union ble_store_key *key, unio
         }
         case BLE_STORE_OBJ_TYPE_CCCD: {
             // TODO: Implement CCCD persistence.
-            DEBUG_printf("ble_store_ram_read: CCCD not supported.\n");
+            DEBUG_printf("ble_secret_store_read: CCCD not supported.\n");
             return -1;
         }
         default:
@@ -1871,18 +1877,18 @@ STATIC int ble_store_ram_read(int obj_type, const union ble_store_key *key, unio
     const uint8_t *value_data;
     size_t value_data_len;
     if (!mp_bluetooth_gap_on_get_secret(obj_type, key->sec.idx, key_data, key_data_len, &value_data, &value_data_len)) {
-        DEBUG_printf("ble_store_ram_read: Key not found: type=%d, index=%u, key=0x%p, len=" UINT_FMT "\n", obj_type, key->sec.idx, key_data, key_data_len);
+        DEBUG_printf("ble_secret_store_read: Key not found: type=%d, index=%u, key=0x%p, len=" UINT_FMT "\n", obj_type, key->sec.idx, key_data, key_data_len);
         return BLE_HS_ENOENT;
     }
 
     if (value_data_len != sizeof(struct ble_store_value_sec)) {
-        DEBUG_printf("ble_store_ram_read: Invalid key data: actual=" UINT_FMT " expected=" UINT_FMT "\n", value_data_len, sizeof(struct ble_store_value_sec));
+        DEBUG_printf("ble_secret_store_read: Invalid key data: actual=" UINT_FMT " expected=" UINT_FMT "\n", value_data_len, sizeof(struct ble_store_value_sec));
         return BLE_HS_ENOENT;
     }
 
     memcpy((uint8_t *)&value->sec, value_data, sizeof(struct ble_store_value_sec));
 
-    DEBUG_printf("ble_store_ram_read: found secret\n");
+    DEBUG_printf("ble_secret_store_read: found secret\n");
 
     if (obj_type == BLE_STORE_OBJ_TYPE_OUR_SEC) {
         // TODO: Verify ediv_rand matches.
@@ -1891,8 +1897,8 @@ STATIC int ble_store_ram_read(int obj_type, const union ble_store_key *key, unio
     return 0;
 }
 
-STATIC int ble_store_ram_write(int obj_type, const union ble_store_value *val) {
-    DEBUG_printf("ble_store_ram_write: %d\n", obj_type);
+STATIC int ble_secret_store_write(int obj_type, const union ble_store_value *val) {
+    DEBUG_printf("ble_secret_store_write: %d\n", obj_type);
     switch (obj_type) {
         case BLE_STORE_OBJ_TYPE_PEER_SEC:
         case BLE_STORE_OBJ_TYPE_OUR_SEC: {
@@ -1910,13 +1916,13 @@ STATIC int ble_store_ram_write(int obj_type, const union ble_store_value *val) {
                 return BLE_HS_ESTORE_CAP;
             }
 
-            DEBUG_printf("ble_store_ram_write: wrote secret\n");
+            DEBUG_printf("ble_secret_store_write: wrote secret\n");
 
             return 0;
         }
         case BLE_STORE_OBJ_TYPE_CCCD: {
             // TODO: Implement CCCD persistence.
-            DEBUG_printf("ble_store_ram_write: CCCD not supported.\n");
+            DEBUG_printf("ble_secret_store_write: CCCD not supported.\n");
             // Just pretend we wrote it.
             return 0;
         }
@@ -1925,8 +1931,8 @@ STATIC int ble_store_ram_write(int obj_type, const union ble_store_value *val) {
     }
 }
 
-STATIC int ble_store_ram_delete(int obj_type, const union ble_store_key *key) {
-    DEBUG_printf("ble_store_ram_delete: %d\n", obj_type);
+STATIC int ble_secret_store_delete(int obj_type, const union ble_store_key *key) {
+    DEBUG_printf("ble_secret_store_delete: %d\n", obj_type);
     switch (obj_type) {
         case BLE_STORE_OBJ_TYPE_PEER_SEC:
         case BLE_STORE_OBJ_TYPE_OUR_SEC: {
@@ -1940,13 +1946,13 @@ STATIC int ble_store_ram_delete(int obj_type, const union ble_store_key *key) {
                 return BLE_HS_ENOENT;
             }
 
-            DEBUG_printf("ble_store_ram_delete: deleted secret\n");
+            DEBUG_printf("ble_secret_store_delete: deleted secret\n");
 
             return 0;
         }
         case BLE_STORE_OBJ_TYPE_CCCD: {
             // TODO: Implement CCCD persistence.
-            DEBUG_printf("ble_store_ram_delete: CCCD not supported.\n");
+            DEBUG_printf("ble_secret_store_delete: CCCD not supported.\n");
             // Just pretend it wasn't there.
             return BLE_HS_ENOENT;
         }
@@ -1955,15 +1961,6 @@ STATIC int ble_store_ram_delete(int obj_type, const union ble_store_key *key) {
     }
 }
 
-// nimble_port_init always calls ble_store_ram_init. We provide this alternative
-// implementation rather than the one in nimble/store/ram/src/ble_store_ram.c.
-// TODO: Consider re-implementing nimble_port_init instead.
-void ble_store_ram_init(void) {
-    ble_hs_cfg.store_read_cb = ble_store_ram_read;
-    ble_hs_cfg.store_write_cb = ble_store_ram_write;
-    ble_hs_cfg.store_delete_cb = ble_store_ram_delete;
-}
-
 #endif // MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
 
 #endif // MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_NIMBLE
diff --git a/extmod/nimble/nimble/nimble_npl_os.h b/extmod/nimble/nimble/nimble_npl_os.h
index d0803f7e2e..3205baa032 100644
--- a/extmod/nimble/nimble/nimble_npl_os.h
+++ b/extmod/nimble/nimble/nimble_npl_os.h
@@ -35,7 +35,11 @@
 // --- Configuration of NimBLE data structures --------------------------------
 
 // This is used at runtime to align allocations correctly.
-#define BLE_NPL_OS_ALIGNMENT (sizeof(uintptr_t))
+#if __WORDSIZE == 64
+#define BLE_NPL_OS_ALIGNMENT 8
+#else
+#define BLE_NPL_OS_ALIGNMENT 4
+#endif
 #define BLE_NPL_TIME_FOREVER (0xffffffff)
 
 // This is used at compile time to force struct member alignment. See
diff --git a/lib/mynewt-nimble b/lib/mynewt-nimble
index 97ce3eacaa..42849560ba 160000
--- a/lib/mynewt-nimble
+++ b/lib/mynewt-nimble
@@ -1 +1 @@
-Subproject commit 97ce3eacaaa79e8ed6cf71717149ced4f5328ee7
+Subproject commit 42849560ba7906f023f61e5f7ff3709ba2c1dfca