diff --git a/dune-project b/dune-project
index 665cdaf..0b66dee 100644
--- a/dune-project
+++ b/dune-project
@@ -1,3 +1,3 @@
-(lang dune 2.0)
+(lang dune 2.3)
 (name prometheus)
 (formatting disabled)
diff --git a/examples/dune b/examples/dune
index 6fd7b91..dffb682 100644
--- a/examples/dune
+++ b/examples/dune
@@ -1,3 +1,4 @@
 (executable
   (name         example)
+  (enabled_if   (>= %{ocaml_version} 4.08)) ; Work-around for dune bug #5621
   (libraries    prometheus prometheus-app.unix cmdliner cohttp-lwt cohttp-lwt-unix))
diff --git a/prometheus-app.opam b/prometheus-app.opam
index cfc073d..998f685 100644
--- a/prometheus-app.opam
+++ b/prometheus-app.opam
@@ -26,7 +26,7 @@ doc: "https://mirage.github.io/prometheus/"
 bug-reports: "https://github.com/mirage/prometheus/issues"
 depends: [
   "ocaml" {>= "4.08"}
-  "dune" {>= "2.0"}
+  "dune" {>= "2.3"}
   "prometheus" {= version}
   "fmt" {>= "0.8.7"}
   "re"
diff --git a/prometheus.opam b/prometheus.opam
index 47c423f..95512bc 100644
--- a/prometheus.opam
+++ b/prometheus.opam
@@ -8,7 +8,7 @@ doc: "https://mirage.github.io/prometheus/"
 bug-reports: "https://github.com/mirage/prometheus/issues"
 depends: [
   "ocaml" {>= "4.01.0"}
-  "dune" {>= "2.0"}
+  "dune" {>= "2.3"}
   "astring"
   "asetmap"
   "re"