diff --git a/Changes.md b/Changes.md
index 2d6bf3ee79..901f649415 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,6 +1,13 @@
-1.x.x.x (relative to 1.4.x.x)
+1.x.x.x (relative to 1.5.0.0a1)
 =======
 
+
+
+1.5.0.0a1 (relative to 1.4.13.0)
+=========
+
+> Note : Gaffer 1.5 marks the end of provision of GCC 9 builds on Linux. Use Gaffer 1.4 if you require GCC 9 builds.
+
 Features
 --------
 
diff --git a/SConstruct b/SConstruct
index 4ad476aab3..e251fb9999 100644
--- a/SConstruct
+++ b/SConstruct
@@ -65,7 +65,7 @@ gafferMilestoneVersion = 1 # for announcing major milestones - may contain all o
 gafferMajorVersion = 5 # backwards-incompatible changes
 gafferMinorVersion = 0 # new backwards-compatible features
 gafferPatchVersion = 0 # bug fixes
-gafferVersionSuffix = "" # used for alpha/beta releases : "a1", "b2", etc.
+gafferVersionSuffix = "a1" # used for alpha/beta releases : "a1", "b2", etc.
 
 # All of the following must be considered when determining
 # whether or not a change is backwards-compatible