diff --git a/uri-bench.opam b/uri-bench.opam
index e2f777b..380fdf1 100644
--- a/uri-bench.opam
+++ b/uri-bench.opam
@@ -12,7 +12,7 @@ description: """
 This is a benchmarking package for the OCaml implementation of the [RFC3986](http://tools.ietf.org/html/rfc3986) specification for parsing URI or URLs.
 """
 depends: [
-  "ocaml" {>= "4.04.0"}
+  "ocaml" {>= "4.08.0"}
   "dune" {>= "1.2.0"}
   "uri" {= version}
   "core_bench" {>= "v0.14.0"}
diff --git a/uri-re.opam b/uri-re.opam
index a1a910d..85c4ed9 100644
--- a/uri-re.opam
+++ b/uri-re.opam
@@ -13,7 +13,7 @@ This is an OCaml implementation of the [RFC3986](http://tools.ietf.org/html/rfc3
 for parsing URI or URLs.
 """
 depends: [
-  "ocaml" {>= "4.04.0"}
+  "ocaml" {>= "4.08.0"}
   "dune" {>= "1.2.0"}
   "ounit2" {with-test & >= "1.0.2"}
   "ppx_sexp_conv" {with-test & >= "v0.9.0"}
diff --git a/uri.opam b/uri.opam
index 5cee37a..7885ca6 100644
--- a/uri.opam
+++ b/uri.opam
@@ -13,7 +13,7 @@ This is an OCaml implementation of the [RFC3986](http://tools.ietf.org/html/rfc3
 for parsing URI or URLs.
 """
 depends: [
-  "ocaml" {>= "4.04.0"}
+  "ocaml" {>= "4.08.0"}
   "dune" {>= "1.2.0"}
   "ounit2" {with-test & >= "1.0.2"}
   "ppx_sexp_conv" {with-test & >= "v0.9.0"}