diff --git a/configure/CONFIG_BASE_VERSION b/configure/CONFIG_BASE_VERSION
index 667b9f514..35911c310 100644
--- a/configure/CONFIG_BASE_VERSION
+++ b/configure/CONFIG_BASE_VERSION
@@ -31,15 +31,11 @@ EPICS_MODIFICATION = 9
 
 # EPICS_PATCH_LEVEL must be a number (win32 resource file requirement)
 # Not included if zero
-EPICS_PATCH_LEVEL = 0
+EPICS_PATCH_LEVEL = 1
 
 # This will end in -DEV between official releases
-#EPICS_DEV_SNAPSHOT=-DEV
-#EPICS_DEV_SNAPSHOT=-pre1
-#EPICS_DEV_SNAPSHOT=-pre1-DEV
-#EPICS_DEV_SNAPSHOT=-rc1
-#EPICS_DEV_SNAPSHOT=-rc1-DEV
-EPICS_DEV_SNAPSHOT=
+EPICS_DEV_SNAPSHOT=-DEV
+#EPICS_DEV_SNAPSHOT=
 
 # No changes should be needed below here
 
diff --git a/documentation/RELEASE_NOTES.md b/documentation/RELEASE_NOTES.md
index fa180b685..948a17c21 100644
--- a/documentation/RELEASE_NOTES.md
+++ b/documentation/RELEASE_NOTES.md
@@ -1,5 +1,11 @@
 # EPICS Base Release 3.15.9
 
+This version of EPICS Base has not been released yet.
+
+## Changes made on the 3.15 branch since 3.15.9
+
+<!-- Insert new items immediately below here ... -->
+
 ## Changes made between 3.15.8 and 3.15.9
 
 ### Use waitable timers on Microsoft Windows