diff --git a/include/etl/version.h b/include/etl/version.h
index a763d4fc..4d30e25f 100644
--- a/include/etl/version.h
+++ b/include/etl/version.h
@@ -38,7 +38,7 @@ SOFTWARE.
 ///\ingroup utilities
 
 #define ETL_VERSION_MAJOR 20
-#define ETL_VERSION_MINOR 12
+#define ETL_VERSION_MINOR 13
 #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)
diff --git a/library.json b/library.json
index 6a2af629..d18c46c6 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "ETL Embedded Template Library",
-  "version": "20.12.0",
+  "version": "20.13.0",
   "author s": {
     "name": "John Wellbelove",
     "email": "john.wellbelove@etlcpp.com"
diff --git a/library.properties b/library.properties
index aa7cb1c7..37a22174 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Embedded Template Library ETL
-version=20.12.0
+version=20.13.0
 author= John Wellbelove <john.wellbelove@etlcpp.com>
 maintainer=John Wellbelove <john.wellbelove@etlcpp.com>
 license=MIT
diff --git a/meson.build b/meson.build
index aa473f82..095f2da6 100644
--- a/meson.build
+++ b/meson.build
@@ -8,7 +8,7 @@ project('PROJECT_NAME',
 		'cpp_std=c++17', 'build.cpp_std=c++17',
 	],
 	meson_version: '>=0.54.0',
-	version: '20.12.0'
+	version: '20.13.0'
 )
 
 ######################
diff --git a/support/Release notes.txt b/support/Release notes.txt
index ab82c5b0..a0b8388c 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -1,3 +1,7 @@
+===============================================================================
+20.13.0
+Added a specialisation of etl::delegate_service to allow constexpr service.
+
 ===============================================================================
 20.12.0
 Added the option to derived etl::message<> from a parent class other than etl::imessage.