diff --git a/containers-data.opam b/containers-data.opam
index 281a00e6..f50e954d 100644
--- a/containers-data.opam
+++ b/containers-data.opam
@@ -11,7 +11,7 @@ build: [
 ]
 depends: [
   "ocaml" { >= "4.03.0" }
-  "dune" { >= "1.1" }
+  "dune" { >= "1.4" }
   "containers" { = version }
   "seq"
   "qtest" { with-test }
diff --git a/containers-thread.opam b/containers-thread.opam
index d0d4baab..a2d3dd0f 100644
--- a/containers-thread.opam
+++ b/containers-thread.opam
@@ -11,7 +11,7 @@ build: [
 ]
 depends: [
   "ocaml" { >= "4.03.0" }
-  "dune" { >= "1.1" }
+  "dune" { >= "1.4" }
   "base-threads"
   "dune-configurator"
   "containers" { = version }
diff --git a/containers.opam b/containers.opam
index 14002208..7da8de9a 100644
--- a/containers.opam
+++ b/containers.opam
@@ -12,7 +12,7 @@ build: [
 ]
 depends: [
   "ocaml" { >= "4.03.0" }
-  "dune" { >= "1.1" }
+  "dune" { >= "1.4" }
   "dune-configurator"
   "seq"
   "qtest" { with-test }
diff --git a/dune-project b/dune-project
index 7655de07..f9337290 100644
--- a/dune-project
+++ b/dune-project
@@ -1 +1 @@
-(lang dune 1.1)
+(lang dune 1.4)
diff --git a/examples/ccparse_irclogs.ml b/examples/ccparse_irclogs_real.cond.ml
similarity index 100%
rename from examples/ccparse_irclogs.ml
rename to examples/ccparse_irclogs_real.cond.ml
diff --git a/examples/dune b/examples/dune
index 2b0405bc..13b6e613 100644
--- a/examples/dune
+++ b/examples/dune
@@ -2,10 +2,7 @@
 (executables
   (names id_sexp ccparse_sexp ccparse_irclogs)
   (libraries containers)
-  ;(modules id_sexp)
-  (flags :standard -warn-error -a+8 -safe-string -color always)
-  (ocamlopt_flags :standard -O3 -color always
-                   -unbox-closures -unbox-closures-factor 20))
+  (flags :standard -warn-error -a+8))
 
 (alias
   (name runtest)
@@ -23,6 +20,16 @@
     (ignore-stdout
       (run ./ccparse_sexp.exe test_data/benchpress.sexp))))
 
+(rule
+  (targets ccparse_irclogs.ml)
+  (enabled_if (>= %{ocaml_version} "4.08"))
+  (action (copy ccparse_irclogs_real.cond.ml %{targets})))
+
+(rule
+  (targets ccparse_irclogs.ml)
+  (enabled_if (< %{ocaml_version} "4.08"))
+  (action (with-stdout-to %{targets} (run echo "let() = print_endline {|ok|}"))))
+
 (alias
   (name runtest)
   (locks /ctest)