diff --git a/library.json b/library.json
index 843e30d..b01148e 100644
--- a/library.json
+++ b/library.json
@@ -6,7 +6,7 @@
         "type": "git",
         "url": "https://github.com/stm32duino/FatFs.git"
     },
-    "version": "2.1.4",
+    "version": "4.0.0",
     "authors": [
         {
             "url": "http://elm-chan.org/fsw/ff/00index_e.html",
diff --git a/library.properties b/library.properties
index 5d4c4a6..ada8568 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=FatFs
-version=2.1.4
+version=4.0.0
 author=Chan <user5@elm-chan org>, ST
 maintainer=stm32duino
 sentence=FAT file system based on open-source FatFS solution.