diff --git a/.gitignore b/.gitignore
index b678403..a933a49 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 _build
 .merlin
 *.swp
+_opam
diff --git a/CHANGES.md b/CHANGES.md
index b1082ce..e8e9d8a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+### v1.2.1 (2020-05-11)
+
+* Fix minimal dune version (1.4) (#108 @samoht)
+
 ### v1.2.0 (2019-11-01)
 
 * adapt to mirage-protocols 4.0.0 and tcpip 4.0.0 changes (#105 @hannesm)
diff --git a/charrua-client-lwt.opam b/charrua-client-lwt.opam
index b181ec7..79073e2 100644
--- a/charrua-client-lwt.opam
+++ b/charrua-client-lwt.opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "dune" {>= "1.2.0"}
+  "dune" {>= "1.4.0"}
   "ocaml" {>= "4.06.0"}
   "alcotest"     {with-test}
   "cstruct-unix" {with-test}
diff --git a/charrua-client-mirage.opam b/charrua-client-mirage.opam
index ed3e8b1..7035945 100644
--- a/charrua-client-mirage.opam
+++ b/charrua-client-mirage.opam
@@ -13,7 +13,7 @@ build: [
 ]
 
 depends: [
-  "dune" {>= "1.2.0"}
+  "dune" {>= "1.4.0"}
   "ocaml" {>= "4.06.0"}
   "charrua-client-lwt" {= version}
   "ipaddr" {>= "4.0.0"}
diff --git a/charrua-client.opam b/charrua-client.opam
index 73e7697..6dab6ce 100644
--- a/charrua-client.opam
+++ b/charrua-client.opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "dune" {>= "1.2.0"}
+  "dune" {>= "1.4.0"}
   "ocaml" {>= "4.06.0"}
   "alcotest"     {with-test}
   "cstruct-unix" {with-test}
diff --git a/charrua-server.opam b/charrua-server.opam
index 38f275d..acc287e 100644
--- a/charrua-server.opam
+++ b/charrua-server.opam
@@ -15,7 +15,7 @@ build: [
 
 depends: [
   "ocaml"         {>= "4.06.0"}
-  "dune"          {>= "1.2.0"}
+  "dune"          {>= "1.4.0"}
   "ppx_sexp_conv" {>= "v0.9.0"}
   "menhir"        {build}
   "charrua"       {= version}
diff --git a/charrua-unix.opam b/charrua-unix.opam
index df92b1e..50557f4 100644
--- a/charrua-unix.opam
+++ b/charrua-unix.opam
@@ -10,7 +10,7 @@ build: [
   ["dune" "build" "-p" name "-j" jobs]
 ]
 depends: [
-  "dune" {>= "1.2.0"}
+  "dune" {>= "1.4.0"}
   "ocaml" {>= "4.06.0"}
   "lwt" {>="3.0.0"}
   "lwt_log"
diff --git a/charrua.opam b/charrua.opam
index 429df07..b98fd4d 100644
--- a/charrua.opam
+++ b/charrua.opam
@@ -14,7 +14,7 @@ build: [
 
 depends: [
   "ocaml"         {>= "4.06.0"}
-  "dune"          {>= "1.2.0"}
+  "dune"          {>= "1.4.0"}
   "ppx_sexp_conv" {>="v0.10.0"}
   "ppx_cstruct"
   "cstruct"       {>= "3.0.1"}
diff --git a/dune-project b/dune-project
index 2527028..c3c2274 100644
--- a/dune-project
+++ b/dune-project
@@ -1,3 +1,3 @@
-(lang dune 1.2)
+(lang dune 1.4)
 (name charrua)
 (using menhir 2.0)