diff --git a/ca-certs.opam b/ca-certs.opam
index b65f0a4..dcf1e3e 100644
--- a/ca-certs.opam
+++ b/ca-certs.opam
@@ -1,4 +1,3 @@
-version: "0.2.2"
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
 synopsis: "Detect root CA certificates from the operating system"
@@ -28,6 +27,9 @@ depends: [
   "alcotest" {with-test}
   "fmt" {with-test & >= "0.8.7"}
 ]
+conflicts: [
+  "result" {< "1.5"}
+]
 dev-repo: "git+https://github.com/mirage/ca-certs.git"
 build: [
   ["dune" "subst"] {dev}
@@ -46,4 +48,4 @@ build: [
 tags: ["org:mirage"]
 depexts: [
   ["ca_root_nss"] {os = "freebsd"}
-]
\ No newline at end of file
+]
diff --git a/debian/changelog b/debian/changelog
index 6b8f4f1..e050b1b 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+ocaml-ca-certs (0.2.2+git20211209.1.39d203d-1) UNRELEASED; urgency=low
+
+  * New upstream snapshot.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Sat, 09 Apr 2022 09:42:09 -0000
+
 ocaml-ca-certs (0.2.2-2) unstable; urgency=medium
 
   * Fix FTBFS on bytecode architectures
diff --git a/dune-project b/dune-project
index f91c08e..91e633d 100644
--- a/dune-project
+++ b/dune-project
@@ -1,6 +1,5 @@
 (lang dune 2.0)
 (name ca-certs)
-(version v0.2.2)
 
 (generate_opam_files true)
 (source (github mirage/ca-certs))
@@ -17,6 +16,7 @@
   (ocaml (>= 4.08.0))
   (alcotest :with-test)
   (fmt (and :with-test (>= 0.8.7))))
+ (conflicts (result (< 1.5)))
  (synopsis "Detect root CA certificates from the operating system")
  (description
    "\> TLS requires a set of root anchors (Certificate Authorities) to