diff --git a/library.json b/library.json
index f3b5bd2..b0a4281 100644
--- a/library.json
+++ b/library.json
@@ -12,7 +12,7 @@
   [
     {
       "name": "PageBuilder",
-      "version": ">=1.4.0"
+      "version": ">=1.4.2"
     },
     {
       "name": "ArduinoJson",
diff --git a/mkdocs/advancedusage.md b/mkdocs/advancedusage.md
index fe60d43..a402fc0 100644
--- a/mkdocs/advancedusage.md
+++ b/mkdocs/advancedusage.md
@@ -807,7 +807,7 @@ void loop() {
 ```
 
 !!! info "PageBuilder v1.4.0 or later needed"
-    [PageBuilder](https://github.com/Hieromon/PageBuilder) v1.4.1 or later is required to use HTTP authentication with AutoConnect.
+    [PageBuilder](https://github.com/Hieromon/PageBuilder) v1.4.0 or later is required to use HTTP authentication with AutoConnect. Also, v1.4.2 or later is required to eliminate SPIFFS, which is deprecated as a file system for ESP8266 module.
 
 !!! warning "Can not use ESP32 arduino core 1.0.4 stable release"
     For ESP32, Arduino core 1.0.4 stable has a bug for HTTP authentication. The upstream of the master is recommended. (or use 1.0.5 later)
diff --git a/mkdocs/index.md b/mkdocs/index.md
index 1ab572e..17e4b57 100644
--- a/mkdocs/index.md
+++ b/mkdocs/index.md
@@ -94,8 +94,8 @@ Install third-party platform using the *Boards Manager* of Arduino IDE. You can
 <i class="fa fa-download"></i> <strong>Additional library (Required)</strong>
 
 The [PageBuilder](https://github.com/Hieromon/PageBuilder) library to build HTML for ESP8266WebServer is needed.  
-To install the PageBuilder library into your Arduino IDE, you can use the *Library Manager*. Select the board of ESP8266 series in the Arduino IDE, open the library manager and search keyword '**PageBuilder**' with the topic '**Communication**', then you can see the *PageBuilder*. The latest version is required **1.4.0** **later**.[^1]
-[^1]:Since AutoConnect v1.2.0, PageBuilder v1.4.0 later is required.
+To install the PageBuilder library into your Arduino IDE, you can use the *Library Manager*. Select the board of ESP8266 series in the Arduino IDE, open the library manager and search keyword '**PageBuilder**' with the topic '**Communication**', then you can see the *PageBuilder*. The latest version is required **1.4.2** **later**.[^1]
+[^1]:Since AutoConnect v1.2.0, PageBuilder v1.4.2 later is required.
 
 <img src="images/lm.png" width="640"/>