diff --git a/Changes.md b/Changes.md
index 7c89d0d454a..8e6fcbfbc11 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,3 +1,8 @@
+1.x.x.x (relative to 1.5.x.x)
+=======
+
+
+
 1.5.0.0 (relative to 1.4.15.0)
 =======
 
diff --git a/SConstruct b/SConstruct
index ab5b90166b5..7b91c1b6dcd 100644
--- a/SConstruct
+++ b/SConstruct
@@ -62,7 +62,7 @@ if codecs.lookup( locale.getpreferredencoding() ).name != "utf-8" :
 ###############################################################################################
 
 gafferMilestoneVersion = 1 # for announcing major milestones - may contain all of the below
-gafferMajorVersion = 5 # backwards-incompatible changes
+gafferMajorVersion = 6 # backwards-incompatible changes
 gafferMinorVersion = 0 # new backwards-compatible features
 gafferPatchVersion = 0 # bug fixes
 gafferVersionSuffix = "" # used for alpha/beta releases : "a1", "b2", etc.