diff --git a/README.md b/README.md
index 69ce4e7ed..b8741f519 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,15 @@ The autogenerated OSAL user's guide can be viewed at <https://github.com/nasa/cF
 
 ## Version History
 
+### Development Build: 5.1.0-rc1+dev75
+
+- Ensure that the handle is not NULL before invoking dlclose(). In particular the handle will be NULL for static modules. Shutdown after CTRL+C occurs normally (no segfault).
+- Add a "flags" parameter to OS_ModuleLoad() to indicate the desired symbol visibility:
+    - GLOBAL (0, the default, and matches current behavior)
+    - LOCAL which hides from other modules and prevents other modules from binding to symbols in this module, thereby ensuring/preserving the ability to unload in the future
+  - CFE should use LOCAL flag for apps, and GLOBAL flags for libraries.
+- See <https://github.com/nasa/osal/pull/652>
+
 ### Development Build: 5.1.0-rc1+dev68
 
 - When `OS_DEBUG` is enabled, this adds a message if mutex give/take actions occur outside the expected sequence. This informs the user (via the debug console) if a lock is taken more than once or if a lock is given by a different task than the one that originally took it:
diff --git a/src/os/inc/osapi-version.h b/src/os/inc/osapi-version.h
index 98d95a4a8..f8df9294b 100644
--- a/src/os/inc/osapi-version.h
+++ b/src/os/inc/osapi-version.h
@@ -30,7 +30,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define OS_BUILD_NUMBER   67
+#define OS_BUILD_NUMBER   75
 #define OS_BUILD_BASELINE "v5.1.0-rc1"
 
 /*