diff --git a/library.properties b/library.properties
index b7a8ddfa..14217d0d 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=RadioLib
-version=4.0.0
+version=4.0.1
 author=Jan Gromes <gromes.jan@gmail.com>
 maintainer=Jan Gromes <gromes.jan@gmail.com>
 sentence=Universal wireless communication library for Arduino
diff --git a/src/BuildOpt.h b/src/BuildOpt.h
index 66697fac..07a21840 100644
--- a/src/BuildOpt.h
+++ b/src/BuildOpt.h
@@ -335,7 +335,7 @@
 // version definitions
 #define RADIOLIB_VERSION_MAJOR  (0x04)
 #define RADIOLIB_VERSION_MINOR  (0x00)
-#define RADIOLIB_VERSION_PATCH  (0x00)
+#define RADIOLIB_VERSION_PATCH  (0x01)
 #define RADIOLIB_VERSION_EXTRA  (0x00)
 
 #define RADIOLIB_VERSION ((RADIOLIB_VERSION_MAJOR << 24) | (RADIOLIB_VERSION_MINOR << 16) | (RADIOLIB_VERSION_PATCH << 8) | (RADIOLIB_VERSION_EXTRA))