diff --git a/include/etl/version.h b/include/etl/version.h
index 66be8cfa..c05e0dd3 100644
--- a/include/etl/version.h
+++ b/include/etl/version.h
@@ -38,8 +38,8 @@ SOFTWARE.
 ///\ingroup utilities
 
 #define ETL_VERSION_MAJOR 20
-#define ETL_VERSION_MINOR  3
-#define ETL_VERSION_PATCH  1
+#define ETL_VERSION_MINOR  4
+#define ETL_VERSION_PATCH  0
 #define ETL_VERSION       ETL_STRINGIFY(ETL_VERSION_MAJOR) "." ETL_STRINGIFY(ETL_VERSION_MINOR) "." ETL_STRINGIFY(ETL_VERSION_PATCH)
 #define ETL_VERSION_W     ETL_STRINGIFY(ETL_VERSION_MAJOR) L"." ETL_STRINGIFY(ETL_VERSION_MINOR) L"." ETL_STRINGIFY(ETL_VERSION_PATCH)
 #define ETL_VERSION_U16   ETL_STRINGIFY(ETL_VERSION_MAJOR) u"." ETL_STRINGIFY(ETL_VERSION_MINOR) u"." ETL_STRINGIFY(ETL_VERSION_PATCH)
diff --git a/library.json b/library.json
index a17571db..38ae01df 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "ETL Embedded Template Library",
-  "version": "20.3.1",
+  "version": "20.4.0",
   "author s": {
     "name": "John Wellbelove",
     "email": "john.wellbelove@etlcpp.com"
diff --git a/library.properties b/library.properties
index 805c76b7..8b058fe6 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Embedded Template Library ETL
-version=20.3.1
+version=20.4.0
 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 94ba173f..c4512819 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -1,3 +1,7 @@
+===============================================================================
+20.4.0
+Added uninitialized_resize() to etl::vector and etl::basic_string.
+
 ===============================================================================
 20.3.1
 Added ETL_CONSTANT to numeric_limits member functions.