diff --git a/arduino/library-arduino.json b/arduino/library-arduino.json
index 52f70da7..1fcc1692 100644
--- a/arduino/library-arduino.json
+++ b/arduino/library-arduino.json
@@ -1,6 +1,6 @@
 {
   "name": "Embedded Template Library ETL",
-  "version": "20.41.3",
+  "version": "20.41.4",
   "authors": {
     "name": "John Wellbelove",
     "email": "john.wellbelove@etlcpp.com"
diff --git a/arduino/library-arduino.properties b/arduino/library-arduino.properties
index f324c9af..440cff27 100644
--- a/arduino/library-arduino.properties
+++ b/arduino/library-arduino.properties
@@ -1,5 +1,5 @@
 name=Embedded Template Library ETL
-version=20.41.3
+version=20.41.4
 author= John Wellbelove <john.wellbelove@etlcpp.com>
 maintainer=John Wellbelove <john.wellbelove@etlcpp.com>
 license=MIT
diff --git a/include/etl/basic_string.h b/include/etl/basic_string.h
index 1b74ae6f..bae3d516 100644
--- a/include/etl/basic_string.h
+++ b/include/etl/basic_string.h
@@ -2510,7 +2510,7 @@ namespace etl
 #if ETL_HAS_STRING_TRUNCATION_CHECKS
       set_truncated(false);
 #endif
-      etl::fill(&p_buffer[current_size], &p_buffer[CAPACITY + 1U], T(0));
+      etl::mem_set(&p_buffer[current_size], &p_buffer[CAPACITY + 1U], char(0));
     }
 
     //*********************************************************************
diff --git a/include/etl/version.h b/include/etl/version.h
index 4b7e7725..b04a2070 100644
--- a/include/etl/version.h
+++ b/include/etl/version.h
@@ -40,7 +40,7 @@ SOFTWARE.
 
 #define ETL_VERSION_MAJOR 20
 #define ETL_VERSION_MINOR 41
-#define ETL_VERSION_PATCH 3
+#define ETL_VERSION_PATCH 4
 
 #define ETL_VERSION       ETL_STRING(ETL_VERSION_MAJOR) "." ETL_STRING(ETL_VERSION_MINOR) "." ETL_STRING(ETL_VERSION_PATCH)
 #define ETL_VERSION_W     ETL_WIDE_STRING(ETL_VERSION_MAJOR) L"." ETL_WIDE_STRING(ETL_VERSION_MINOR) L"." ETL_WIDE_STRING(ETL_VERSION_PATCH)
diff --git a/library.json b/library.json
index b38cf18e..3b080992 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "Embedded Template Library",
-  "version": "20.41.3",
+  "version": "20.41.4",
   "authors": {
     "name": "John Wellbelove",
     "email": "john.wellbelove@etlcpp.com"
diff --git a/library.properties b/library.properties
index a581b8e9..0ce91fef 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Embedded Template Library
-version=20.41.3
+version=20.41.4
 author= John Wellbelove <john.wellbelove@etlcpp.com>
 maintainer=John Wellbelove <john.wellbelove@etlcpp.com>
 license=MIT
diff --git a/support/Release notes.txt b/support/Release notes.txt
index ea0f6173..b5797d91 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -1,4 +1,14 @@
 ===============================================================================
+20.41.4
+
+Updates:
+Optimisation of etl::basic_string<T>::initialize_free_space() using etl::mem_set
+
+Pull Requests:
+#1113 Add missing header wchar.h for usage of wcslen()
+#1114 Fix West support and add ETL configuration options to Kconfig
+
+===============================================================================
 20.41.3
 
 Updates:
diff --git a/version.txt b/version.txt
index f2dc57d3..c365e766 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-20.41.3
+20.41.4