diff --git a/CHANGELOG.md b/CHANGELOG.md
index 203aa92b..ad6198d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Development Build: equuleus-rc1+dev55
+- rename parameter in CFE_PSP_MemSet handler to align with stub and actual code
+- See <https://github.com/nasa/PSP/pull/441>
+
 ## Development Build: equuleus-rc1+dev49
 - buffer error in the VxWorks sysmon module
 - add coverage tests for PSP modules
diff --git a/fsw/mcp750-vxworks/inc/psp_version.h b/fsw/mcp750-vxworks/inc/psp_version.h
index 28799cc7..3a02aded 100644
--- a/fsw/mcp750-vxworks/inc/psp_version.h
+++ b/fsw/mcp750-vxworks/inc/psp_version.h
@@ -27,7 +27,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define CFE_PSP_IMPL_BUILD_NUMBER   49
+#define CFE_PSP_IMPL_BUILD_NUMBER   55
 #define CFE_PSP_IMPL_BUILD_BASELINE "equuleus-rc1"
 #define CFE_PSP_BUILD_DEV_CYCLE     "equuleus-rc2" /**< @brief Development: Release name for current development cycle */
 #define CFE_PSP_BUILD_CODENAME      "Equuleus" /**< @brief: Development: Code name for the current build */
diff --git a/fsw/pc-linux/inc/psp_version.h b/fsw/pc-linux/inc/psp_version.h
index 28799cc7..3a02aded 100644
--- a/fsw/pc-linux/inc/psp_version.h
+++ b/fsw/pc-linux/inc/psp_version.h
@@ -27,7 +27,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define CFE_PSP_IMPL_BUILD_NUMBER   49
+#define CFE_PSP_IMPL_BUILD_NUMBER   55
 #define CFE_PSP_IMPL_BUILD_BASELINE "equuleus-rc1"
 #define CFE_PSP_BUILD_DEV_CYCLE     "equuleus-rc2" /**< @brief Development: Release name for current development cycle */
 #define CFE_PSP_BUILD_CODENAME      "Equuleus" /**< @brief: Development: Code name for the current build */
diff --git a/fsw/pc-rtems/inc/psp_version.h b/fsw/pc-rtems/inc/psp_version.h
index 28799cc7..3a02aded 100644
--- a/fsw/pc-rtems/inc/psp_version.h
+++ b/fsw/pc-rtems/inc/psp_version.h
@@ -27,7 +27,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define CFE_PSP_IMPL_BUILD_NUMBER   49
+#define CFE_PSP_IMPL_BUILD_NUMBER   55
 #define CFE_PSP_IMPL_BUILD_BASELINE "equuleus-rc1"
 #define CFE_PSP_BUILD_DEV_CYCLE     "equuleus-rc2" /**< @brief Development: Release name for current development cycle */
 #define CFE_PSP_BUILD_CODENAME      "Equuleus" /**< @brief: Development: Code name for the current build */
diff --git a/ut-stubs/src/cfe_psp_memaccess_api_handlers.c b/ut-stubs/src/cfe_psp_memaccess_api_handlers.c
index 222e56ca..cc914215 100644
--- a/ut-stubs/src/cfe_psp_memaccess_api_handlers.c
+++ b/ut-stubs/src/cfe_psp_memaccess_api_handlers.c
@@ -51,7 +51,7 @@ void UT_DefaultHandler_CFE_PSP_MemCpy(void *UserObj, UT_EntryKey_t FuncKey, cons
     UT_Stub_GetInt32StatusCode(Context, &Status);
     if (Status >= 0)
     {
-        memcpy(dest, src, size);
+        memcpy(dest, src, n);
     }
 }