diff --git a/CHANGES.md b/CHANGES.md
index 288e841f56..33b3116ea5 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+### 1.3.2 (2017-11-22)
+
+- support OCaml 4.06 where `-safe-string` is enabled by default (#477, @djs55)
+
 ### 1.3.1 (2017-08-25)
 
 - irmin-http: update to cohttp.0.99 (#467, @samoht)
diff --git a/irmin-chunk.opam b/irmin-chunk.opam
index 6e5a98813a..ce9c461831 100644
--- a/irmin-chunk.opam
+++ b/irmin-chunk.opam
@@ -14,9 +14,9 @@ build-test: ["jbuilder" "runtest" "-p" name]
 
 depends: [
   "jbuilder" {build & >= "1.0+beta10"}
-  "irmin" {>= "1.2.0"}
+  "irmin" {>= "1.3.0"}
   "lwt"
-  "irmin-mem" {test & >= "1.2.0"}
+  "irmin-mem" {test & >= "1.3.0"}
   "alcotest"  {test & >="0.4.1"}
 ]
 available: [ocaml-version >= "4.01.0"]
diff --git a/irmin-fs.opam b/irmin-fs.opam
index 2bb67658a9..7bff9fc35f 100644
--- a/irmin-fs.opam
+++ b/irmin-fs.opam
@@ -15,7 +15,7 @@ build-test: ["jbuilder" "runtest" "-p" name]
 
 depends: [
   "jbuilder" {build & >= "1.0+beta10"}
-  "irmin"    {>= "1.2.0"}
+  "irmin"    {>= "1.3.0"}
   "alcotest" {test}
   "mtime"    {test & >= "1.0.0"}
 ]
diff --git a/irmin-git.opam b/irmin-git.opam
index 9354266bdc..36e48aeb02 100644
--- a/irmin-git.opam
+++ b/irmin-git.opam
@@ -15,7 +15,7 @@ build-test: ["jbuilder" "runtest" "-p" name]
 
 depends: [
   "jbuilder" {build & >= "1.0+beta10"}
-  "irmin"    {>= "1.2.0"}
+  "irmin"    {>= "1.3.0"}
   "git"      {>= "1.11.0"}
   "alcotest" {test}
   "git-unix" {test & >= "1.11.0"}
diff --git a/irmin-http.opam b/irmin-http.opam
index 5f0efb0065..4d47564b5b 100644
--- a/irmin-http.opam
+++ b/irmin-http.opam
@@ -17,10 +17,10 @@ depends: [
   "jbuilder" {build & >= "1.0+beta10"}
   "crunch"
   "webmachine" {>= "0.3.2"}
-  "irmin"  {>= "1.2.0"}
+  "irmin"  {>= "1.3.0"}
   "cohttp-lwt" {>= "0.99.0"}
-  "irmin-git" {test & >= "1.2.0"}
-  "irmin-mem" {test & >= "1.2.0"}
+  "irmin-git" {test & >= "1.3.0"}
+  "irmin-mem" {test & >= "1.3.0"}
   "alcotest"  {test}
   "mtime"     {test & >= "1.0.0"}
 ]
diff --git a/irmin-mem.opam b/irmin-mem.opam
index 2bb67658a9..7bff9fc35f 100644
--- a/irmin-mem.opam
+++ b/irmin-mem.opam
@@ -15,7 +15,7 @@ build-test: ["jbuilder" "runtest" "-p" name]
 
 depends: [
   "jbuilder" {build & >= "1.0+beta10"}
-  "irmin"    {>= "1.2.0"}
+  "irmin"    {>= "1.3.0"}
   "alcotest" {test}
   "mtime"    {test & >= "1.0.0"}
 ]
diff --git a/irmin-mirage.opam b/irmin-mirage.opam
index 84ce9ebb47..ced7721c64 100644
--- a/irmin-mirage.opam
+++ b/irmin-mirage.opam
@@ -13,9 +13,9 @@ build: [
 
 depends: [
   "jbuilder"   {build & >= "1.0+beta10"}
-  "irmin"      {>= "1.2.0"}
-  "irmin-git"  {>= "1.2.0"}
-  "irmin-mem"  {>= "1.2.0"}
+  "irmin"      {>= "1.3.0"}
+  "irmin-git"  {>= "1.3.0"}
+  "irmin-mem"  {>= "1.3.0"}
   "git-mirage" {>= "1.11.0"}
   "ptime"
   "mirage-kv-lwt"
diff --git a/irmin-unix.opam b/irmin-unix.opam
index 6f8c490b16..1e9f0c578c 100644
--- a/irmin-unix.opam
+++ b/irmin-unix.opam
@@ -15,11 +15,11 @@ build-test: ["jbuilder" "runtest" "-p" name]
 
 depends: [
   "jbuilder"   {build & >= "1.0+beta10"}
-  "irmin"      {>= "1.2.0"}
-  "irmin-mem"  {>= "1.2.0"}
-  "irmin-git"  {>= "1.2.0"}
-  "irmin-http" {>= "1.2.0"}
-  "irmin-fs"   {>= "1.2.0"}
+  "irmin"      {>= "1.3.0"}
+  "irmin-mem"  {>= "1.3.0"}
+  "irmin-git"  {>= "1.3.0"}
+  "irmin-http" {>= "1.3.0"}
+  "irmin-fs"   {>= "1.3.0"}
   "git-unix"   {>= "1.11.0"}
   "irmin-watcher" {>= "0.2.0"}
   "alcotest" {test}
diff --git a/irmin.opam b/irmin.opam
index cb6d4653b1..3e3d3381eb 100644
--- a/irmin.opam
+++ b/irmin.opam
@@ -15,7 +15,7 @@ build: [
 depends: [
   "jbuilder" {build & >= "1.0+beta10"}
   "result"
-  "fmt"
+  "fmt" {>= "0.8.0"}
   "uri" {>= "1.3.12"}
   "cstruct" {>= "1.6.0"}
   "jsonm" {>= "1.0.0"}