diff --git a/dune-project b/dune-project
index 7ee48c5..691d1df 100644
--- a/dune-project
+++ b/dune-project
@@ -21,6 +21,6 @@
  (name sanddb)
  (synopsis "A simple immutable database for the masses")
  (description "SandDB is a simple easy async immutable database")
- (depends ocaml dune atdgen base lwt uuidm alcotest))
+ (depends (ocaml (>= 4.6.0)) dune atdgen base lwt uuidm alcotest))
 
 ; See the complete stanza docs at https://dune.readthedocs.io/en/stable/dune-files.html#dune-project
diff --git a/sanddb.opam b/sanddb.opam
index d7a98b1..199de84 100644
--- a/sanddb.opam
+++ b/sanddb.opam
@@ -10,7 +10,7 @@ homepage: "https://github.com/StrykerKKD/SandDB"
 doc: "https://strykerkkd.github.io/SandDB/"
 bug-reports: "https://github.com/StrykerKKD/SandDB/issues"
 depends: [
-  "ocaml"
+  "ocaml" {>= "4.6.0"}
   "dune" {>= "3.0"}
   "atdgen"
   "base"