diff --git a/Makefile b/Makefile
index 2a4a9f8..062fc6e 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ VERSION := 23
 STATUS := draft-
 OUTPUT := $(STATUS)ietf-cellar-ffv1-$(VERSION)
 
-VERSION-v4 := 20
+VERSION-v4 := 21
 STATUS-v4 := draft-
 OUTPUT-v4 := $(STATUS-v4)ietf-cellar-ffv1-v4-$(VERSION-v4)
 
diff --git a/rfc_frontmatter.md b/rfc_frontmatter.md
index 22005ba..6f95366 100644
--- a/rfc_frontmatter.md
+++ b/rfc_frontmatter.md
@@ -14,7 +14,7 @@ stream = "IETF"
 status = "informational"{V3}
 status = "standard"{V4}
 value = "draft-ietf-cellar-ffv1-23"{V3}
-value = "draft-ietf-cellar-ffv1-v4-20"{V4}
+value = "draft-ietf-cellar-ffv1-v4-21"{V4}
 
 [[author]]
 initials="M."