diff --git a/mk/main.mk b/mk/main.mk
index f8f8be8aab4e5..8983a63e1d13d 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -18,7 +18,7 @@ CFG_RELEASE_NUM=1.2.0
 # An optional number to put after the label, e.g. '.2' -> '-beta.2'
 # NB Make sure it starts with a dot to conform to semver pre-release
 # versions (section 9)
-CFG_PRERELEASE_VERSION=.5
+CFG_PRERELEASE_VERSION=.6
 
 # Append a version-dependent hash to each library, so we can install different
 # versions in the same place