diff --git a/dune-project b/dune-project
index 3381d7ef..2879300c 100644
--- a/dune-project
+++ b/dune-project
@@ -3,6 +3,7 @@
 (formatting disabled)
 (generate_opam_files true)
 (source (github ocurrent/obuilder))
+(license Apache-2.0)
 (authors "talex5@gmail.com")
 (maintainers "talex5@gmail.com")
 (documentation "https://ocurrent.github.io/obuilder/")
@@ -10,7 +11,8 @@
  (name obuilder)
  (synopsis "Run build scripts for CI")
  (description
-  "OBuilder takes a build script (similar to a Dockerfile) and performs the steps in it in a sandboxed environment.")
+   "OBuilder takes a build script (similar to a Dockerfile) and performs the steps in it in a sandboxed environment.")
+ (conflicts (result (< 1.5)))
  (depends
   (lwt (>= 5.5.0))
   astring
diff --git a/obuilder-spec.opam b/obuilder-spec.opam
index aac0d75b..e900c02a 100644
--- a/obuilder-spec.opam
+++ b/obuilder-spec.opam
@@ -5,6 +5,7 @@ description:
   "A library for constructing, reading and writing OBuilder build specification files."
 maintainer: ["talex5@gmail.com"]
 authors: ["talex5@gmail.com"]
+license: "Apache-2.0"
 homepage: "https://github.com/ocurrent/obuilder"
 doc: "https://ocurrent.github.io/obuilder/"
 bug-reports: "https://github.com/ocurrent/obuilder/issues"
diff --git a/obuilder.opam b/obuilder.opam
index b736cb51..d3592624 100644
--- a/obuilder.opam
+++ b/obuilder.opam
@@ -5,6 +5,7 @@ description:
   "OBuilder takes a build script (similar to a Dockerfile) and performs the steps in it in a sandboxed environment."
 maintainer: ["talex5@gmail.com"]
 authors: ["talex5@gmail.com"]
+license: "Apache-2.0"
 homepage: "https://github.com/ocurrent/obuilder"
 doc: "https://ocurrent.github.io/obuilder/"
 bug-reports: "https://github.com/ocurrent/obuilder/issues"
@@ -27,6 +28,9 @@ depends: [
   "alcotest-lwt" {with-test}
   "odoc" {with-doc}
 ]
+conflicts: [
+  "result" {< "1.5"}
+]
 build: [
   ["dune" "subst"] {dev}
   [