diff --git a/CHANGELOG.md b/CHANGELOG.md
index c994b4a2..6ffcc498 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## Development Build: equuleus-rc1+dev38
+- updating PSP to use new versioning system
+- conditional module inclusion
+- See <https://github.com/nasa/PSP/pull/422> and <https://github.com/nasa/PSP/pull/427>
+
 ## Development Build: v1.6.0-rc4+dev117
 - Align mismatched function prototype/implem. parameter names
 - See <https://github.com/nasa/PSP/pull/380>
diff --git a/fsw/mcp750-vxworks/inc/psp_version.h b/fsw/mcp750-vxworks/inc/psp_version.h
index 44e30be1..a7f9e50a 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   115
+#define CFE_PSP_IMPL_BUILD_NUMBER   38
 #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 a5a3c934..a7f9e50a 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   102
+#define CFE_PSP_IMPL_BUILD_NUMBER   38
 #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 44e30be1..a7f9e50a 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   115
+#define CFE_PSP_IMPL_BUILD_NUMBER   38
 #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 */