diff --git a/configure/CONFIG_BASE_VERSION b/configure/CONFIG_BASE_VERSION
index eb0a109ea..8933bbf9c 100644
--- a/configure/CONFIG_BASE_VERSION
+++ b/configure/CONFIG_BASE_VERSION
@@ -36,7 +36,7 @@ EPICS_MODIFICATION = 3
 EPICS_PATCH_LEVEL = 0
 
 # This will end in -DEV between official releases
-#EPICS_DEV_SNAPSHOT=-DEV
+EPICS_DEV_SNAPSHOT=-DEV
 #EPICS_DEV_SNAPSHOT=-pre1
 #EPICS_DEV_SNAPSHOT=-pre1-DEV
 #EPICS_DEV_SNAPSHOT=-pre2
@@ -45,7 +45,7 @@ EPICS_PATCH_LEVEL = 0
 #EPICS_DEV_SNAPSHOT=-rc1-DEV
 #EPICS_DEV_SNAPSHOT=-rc2
 #EPICS_DEV_SNAPSHOT=-rc2-DEV
-EPICS_DEV_SNAPSHOT=
+#EPICS_DEV_SNAPSHOT=
 
 # No changes should be needed below here
 
diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index 073143583..5e39e2680 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -9,6 +9,8 @@
 <body lang="en">
 <h1 align="center">EPICS Base Release 3.15.3</h1>
 
+<p style="color:red">This version of EPICS Base has not been released yet.</p>
+
 <h2 align="center">Changes between 3.15.2 and 3.15.3</h2>
 <!-- Insert new items immediately below here ... -->
 
