diff --git a/Makefile b/Makefile
index f4885b8..c5c3936 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ update-version: VERSION=$(shell cat Changelog | grep -E '^[0-9]' | head -n 1)
 update-version:
 	@echo "Set version to $(VERSION)"
 	@sed -i 's/^version: .*/version: "$(VERSION)"/' *.opam
-	@sed -i 's/^\( *\)"ppx_protocol_conv" { >= ".*" }/\1"ppx_protocol_conv" { >= "$(VERSION)" }/' ppx_protocol_conv_*.opam
+	@sed -i 's/^\( *\)"ppx_protocol_conv" {[ ]*>= ".*"[ ]*}/\1"ppx_protocol_conv" {>= "$(VERSION)"}/' ppx_protocol_conv_*.opam
 
 release:
 	opam publish
diff --git a/ppx_protocol_conv_json.opam b/ppx_protocol_conv_json.opam
index 78e98c6..5c4accd 100644
--- a/ppx_protocol_conv_json.opam
+++ b/ppx_protocol_conv_json.opam
@@ -11,7 +11,7 @@ build: [
 ]
 depends: [
   "ocaml" {>= "4.04.0"}
-  "ppx_protocol_conv" {>= "3.1.1"}
+  "ppx_protocol_conv" {>= "3.1.3"}
   "yojson" {>= "1.6.0"}
   "dune" {build}
   "ppx_sexp_conv" {with-test & < "v0.12"}
diff --git a/ppx_protocol_conv_jsonm.opam b/ppx_protocol_conv_jsonm.opam
index 6d30fd1..b727b08 100644
--- a/ppx_protocol_conv_jsonm.opam
+++ b/ppx_protocol_conv_jsonm.opam
@@ -11,7 +11,7 @@ build: [
 ]
 depends: [
   "ocaml" {>= "4.04"}
-  "ppx_protocol_conv" {>= "3.1.1"}
+  "ppx_protocol_conv" {>= "3.1.3"}
   "ezjsonm"
   "dune" {build}
   "ppx_sexp_conv" {with-test & < "v0.12"}
diff --git a/ppx_protocol_conv_msgpack.opam b/ppx_protocol_conv_msgpack.opam
index d295f7e..0082300 100644
--- a/ppx_protocol_conv_msgpack.opam
+++ b/ppx_protocol_conv_msgpack.opam
@@ -11,7 +11,7 @@ build: [
 ]
 depends: [
   "ocaml" {>= "4.04.0"}
-  "ppx_protocol_conv" {>= "3.1.1"}
+  "ppx_protocol_conv" {>= "3.1.3"}
   "msgpck"
   "dune" {build}
   "ppx_sexp_conv" {with-test & < "v0.12"}
diff --git a/ppx_protocol_conv_xml_light.opam b/ppx_protocol_conv_xml_light.opam
index 3b3d5df..195364b 100644
--- a/ppx_protocol_conv_xml_light.opam
+++ b/ppx_protocol_conv_xml_light.opam
@@ -11,7 +11,7 @@ build: [
 ]
 depends: [
   "ocaml" {>= "4.04.0"}
-  "ppx_protocol_conv" {>= "3.1.1"}
+  "ppx_protocol_conv" {>= "3.1.3"}
   "xml-light"
   "dune" {build}
   "ppx_sexp_conv" {with-test & < "v0.12"}
diff --git a/ppx_protocol_conv_yaml.opam b/ppx_protocol_conv_yaml.opam
index 4c31a4f..9ebbbe7 100644
--- a/ppx_protocol_conv_yaml.opam
+++ b/ppx_protocol_conv_yaml.opam
@@ -11,7 +11,7 @@ build: [
 ]
 depends: [
   "ocaml" {>= "4.04.0"}
-  "ppx_protocol_conv" {>= "3.1.1"}
+  "ppx_protocol_conv" {>= "3.1.3"}
   "yaml"
   "dune" {build}
   "ppx_sexp_conv" {with-test & < "v0.12"}