diff --git a/README.md b/README.md
index d0986500c..8970e8baf 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,11 @@ The autogenerated OSAL user's guide can be viewed at <https://github.com/nasa/cF
 
 ## Version History
 
+### Development Build: v5.1.0-rc1+dev598
+
+- Add UTAssert macros that help test bit field storage
+- See <https://github.com/nasa/osal/pull/1138> and <https://github.com/nasa/cFS/pull/348>
+
 ### Development Build: v5.1.0-rc1+dev594
 
 - Add test case types similar to NA
diff --git a/src/os/inc/osapi-version.h b/src/os/inc/osapi-version.h
index 679edaee0..e91916b83 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   594
+#define OS_BUILD_NUMBER   598
 #define OS_BUILD_BASELINE "v5.1.0-rc1"
 
 /*