diff --git a/tools/sdk/changelog.txt b/tools/sdk/changelog.txt
index 0b722598f..14fb2bc3a 100644
--- a/tools/sdk/changelog.txt
+++ b/tools/sdk/changelog.txt
@@ -1,3 +1,29 @@
+ESP8266_NONOS_SDK_V1.5.4_16_05_20 Release Note 
+----------------------------------------------
+Optimization:
+1. Updated libphy.a to version 972.
+2. Updated libpp.a to version 10.1, revised issues about frequency offset and sleep mode.
+3. Optimized IGMP function.
+4. Optimized DNS function.
+5. Optimized WPS function.
+6. Optimized DHCP server function.
+7. Optimized wifi_station_get_connect_status function.
+8. Revised the issue that API system_adc_read and system_get_vdd33 may return wrong value.
+9. Optimized API:
+bool espconn_secure_ca_enable(uint8 level, uint32 flash_sector);
+bool espconn_secure_cert_req_enable(uint8 level, uint32 flash_sector);
+
+Added APIs: 
+1. system_adc_read_fast: ADC fast sampling.
+2. wifi_fpm_auto_sleep_set_in_null_mode: set whether enter modem-sleep mode or not when WiFi is in NULL_MODE.
+
+AT_V1.1 Release Note:
+Optimization: 
+1. Optimized the behavior of writing Flash.
+2. Optimized DHCP server function.
+3. Updated command AT+SAVETRANSLINK to save domain name. 
+
+
 ESP8266_NONOS_SDK_V1.5.3_16_04_16 Release Note
 ----------------------------------------------
 Optimization:
diff --git a/tools/sdk/include/c_types.h b/tools/sdk/include/c_types.h
index 9d94a025f..6e55246f2 100644
--- a/tools/sdk/include/c_types.h
+++ b/tools/sdk/include/c_types.h
@@ -74,6 +74,8 @@ typedef enum {
 #define ICACHE_RODATA_ATTR
 #endif /* ICACHE_FLASH */
 
+#define STORE_ATTR __attribute__((aligned(4)))
+
 #ifndef __cplusplus
 #define BOOL            bool
 #define TRUE            true
diff --git a/tools/sdk/include/espconn.h b/tools/sdk/include/espconn.h
index eeb603e99..eca8eaaa4 100644
--- a/tools/sdk/include/espconn.h
+++ b/tools/sdk/include/espconn.h
@@ -512,7 +512,7 @@ sint16 espconn_secure_get_size(uint8 level);
  * Returns      : result true or false
 *******************************************************************************/
 
-bool espconn_secure_ca_enable(uint8 level, uint8 flash_sector );
+bool espconn_secure_ca_enable(uint8 level, uint32 flash_sector );
 
 /******************************************************************************
  * FunctionName : espconn_secure_ca_disable
@@ -535,7 +535,7 @@ bool espconn_secure_ca_disable(uint8 level);
  * Returns      : result true or false
 *******************************************************************************/
 
-bool espconn_secure_cert_req_enable(uint8 level, uint8 flash_sector );
+bool espconn_secure_cert_req_enable(uint8 level, uint32 flash_sector );
 
 /******************************************************************************
  * FunctionName : espconn_secure_ca_disable
diff --git a/tools/sdk/include/osapi.h b/tools/sdk/include/osapi.h
index 1169e5406..6e10759a3 100644
--- a/tools/sdk/include/osapi.h
+++ b/tools/sdk/include/osapi.h
@@ -46,7 +46,7 @@
 
 #ifdef USE_OPTIMIZE_PRINTF
 #define os_printf(fmt, ...) do {	\
-	static const char flash_str[] ICACHE_RODATA_ATTR __attribute__((aligned(4))) = fmt;	\
+	static const char flash_str[] ICACHE_RODATA_ATTR STORE_ATTR = fmt;	\
 	os_printf_plus(flash_str, ##__VA_ARGS__);	\
 	} while(0)
 #else
diff --git a/tools/sdk/include/user_interface.h b/tools/sdk/include/user_interface.h
index 743f413aa..f916afa45 100644
--- a/tools/sdk/include/user_interface.h
+++ b/tools/sdk/include/user_interface.h
@@ -96,6 +96,7 @@ void system_uart_swap(void);
 void system_uart_de_swap(void);
 
 uint16 system_adc_read(void);
+void system_adc_read_fast(uint16 *adc_addr, uint16 adc_num, uint8 adc_clk_div);
 uint16 system_get_vdd33(void);
 
 const char *system_get_sdk_version(void);
@@ -255,7 +256,7 @@ int wifi_station_set_cert_key(uint8 *client_cert, int client_cert_len,
     uint8 *private_key, int private_key_len,
     uint8 *private_key_passwd, int private_key_passwd_len);
 void wifi_station_clear_cert_key(void);
-int wifi_station_set_username(unsigned char*, int);
+int wifi_station_set_username(uint8 *username, int len);
 void wifi_station_clear_username(void);
 
 struct softap_config {
@@ -362,6 +363,7 @@ void wifi_fpm_set_wakeup_cb(fpm_wakeup_cb cb);
 sint8 wifi_fpm_do_sleep(uint32 sleep_time_in_us);
 void wifi_fpm_set_sleep_type(sleep_type_t type);
 sleep_type_t wifi_fpm_get_sleep_type(void);
+void wifi_fpm_auto_sleep_set_in_null_mode(uint8 req);
 
 enum {
     EVENT_STAMODE_CONNECTED = 0,
diff --git a/tools/sdk/lib/libat.a b/tools/sdk/lib/libat.a
index 4db6a1033..36fed2efb 100644
Binary files a/tools/sdk/lib/libat.a and b/tools/sdk/lib/libat.a differ
diff --git a/tools/sdk/lib/liblwip.a b/tools/sdk/lib/liblwip.a
index dbe722dff..2e6ff96bd 100644
Binary files a/tools/sdk/lib/liblwip.a and b/tools/sdk/lib/liblwip.a differ
diff --git a/tools/sdk/lib/libmain.a b/tools/sdk/lib/libmain.a
index 05857bb83..d9b9ed675 100644
Binary files a/tools/sdk/lib/libmain.a and b/tools/sdk/lib/libmain.a differ
diff --git a/tools/sdk/lib/libnet80211.a b/tools/sdk/lib/libnet80211.a
index 3461bae89..34cac64a8 100644
Binary files a/tools/sdk/lib/libnet80211.a and b/tools/sdk/lib/libnet80211.a differ
diff --git a/tools/sdk/lib/libphy.a b/tools/sdk/lib/libphy.a
index 64b17ca26..273baae69 100644
Binary files a/tools/sdk/lib/libphy.a and b/tools/sdk/lib/libphy.a differ
diff --git a/tools/sdk/lib/libpp.a b/tools/sdk/lib/libpp.a
index ec5004193..128628e85 100644
Binary files a/tools/sdk/lib/libpp.a and b/tools/sdk/lib/libpp.a differ
diff --git a/tools/sdk/lib/libssl.a b/tools/sdk/lib/libssl.a
index 14e131a6b..3565e03c2 100644
Binary files a/tools/sdk/lib/libssl.a and b/tools/sdk/lib/libssl.a differ
diff --git a/tools/sdk/version b/tools/sdk/version
index 4afad1988..82c7dcf1d 100644
--- a/tools/sdk/version
+++ b/tools/sdk/version
@@ -1 +1 @@
-1.5.3_16_04_18
\ No newline at end of file
+1.5.4_16_05_20
\ No newline at end of file