diff --git a/README.md b/README.md
index f05ba709e..7d1deac5e 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,13 @@ The autogenerated OSAL user's guide can be viewed at <https://github.com/nasa/cF
 
 ## Version History
 
+### Development Build: v5.1.0-rc1+dev619
+
+- Enable symbol api test and MIR dump too large
+- MIR symbol too long or table to long for osloader test
+- Add bsp-specific configuration flag registry 
+- Add os-specifc socket flag function 
+- See <https://github.com/nasa/osal/pull/1158> and <https://github.com/nasa/cFS/pull/359>
 ### Development Build: v5.1.0-rc1+dev604
 
 - Add typecast to memchr call
diff --git a/src/os/inc/osapi-version.h b/src/os/inc/osapi-version.h
index 62fe1162e..9c1ad5b6e 100644
--- a/src/os/inc/osapi-version.h
+++ b/src/os/inc/osapi-version.h
@@ -36,7 +36,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define OS_BUILD_NUMBER   604
+#define OS_BUILD_NUMBER   619
 #define OS_BUILD_BASELINE "v5.1.0-rc1"
 
 /*