diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d474548d..7ab70b676 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## Development Build: equuleus-rc1+dev53
+- use virtual path as name for FS_BASED maps
+- Remove softsleep, as a dead store.
+- Remove stray remaining 'goto' in OSAL test code
+- Align mismatched function prototype/implem. parameter names
+- Move variables declared mid-function to the top
+- See <https://github.com/nasa/osal/pull/1448>, <https://github.com/nasa/osal/issues/1452>, <https://github.com/nasa/osal/pull/1357>, <https://github.com/nasa/osal/pull/1354>, and <https://github.com/nasa/osal/pull/1331>
+
 ## Development Build: equuleus-rc1+dev41
 - Remove unreachable branch (superfluous if condition)
 - See <https://github.com/nasa/osal/pull/1368>
diff --git a/src/os/inc/osapi-version.h b/src/os/inc/osapi-version.h
index 8fb218689..900eebd3d 100644
--- a/src/os/inc/osapi-version.h
+++ b/src/os/inc/osapi-version.h
@@ -34,7 +34,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define OS_BUILD_NUMBER     41
+#define OS_BUILD_NUMBER     53
 #define OS_BUILD_BASELINE   "equuleus-rc1"
 #define OS_BUILD_DEV_CYCLE  "equuleus-rc2" /**< @brief Development: Release name for current development cycle */
 #define OS_BUILD_CODENAME   "Equuleus" /**< @brief: Development: Code name for the current build */