diff --git a/packages/graphql-cohttp/graphql-cohttp.0.10.0/opam b/packages/graphql-cohttp/graphql-cohttp.0.10.0/opam
index 852e0fb9ccc..e599b04b533 100644
--- a/packages/graphql-cohttp/graphql-cohttp.0.10.0/opam
+++ b/packages/graphql-cohttp/graphql-cohttp.0.10.0/opam
@@ -12,7 +12,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.03.0"}
+  "ocaml" {>= "4.06.0"}
   "dune"
   "graphql" {>= "0.9.0"}
   "cohttp" {>= "2.0.0" & < "6.0.0~~"}
diff --git a/packages/graphql-cohttp/graphql-cohttp.0.12.0/opam b/packages/graphql-cohttp/graphql-cohttp.0.12.0/opam
index 57e30dfb602..743bdab5316 100644
--- a/packages/graphql-cohttp/graphql-cohttp.0.12.0/opam
+++ b/packages/graphql-cohttp/graphql-cohttp.0.12.0/opam
@@ -12,7 +12,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.03.0"}
+  "ocaml" {>= "4.06.0"}
   "dune"
   "graphql" {>= "0.9.0"}
   "cohttp" {>= "2.0.0" & < "6.0.0~~"}
diff --git a/packages/graphql-cohttp/graphql-cohttp.0.12.1/opam b/packages/graphql-cohttp/graphql-cohttp.0.12.1/opam
index 5020c602e98..720bc0698af 100644
--- a/packages/graphql-cohttp/graphql-cohttp.0.12.1/opam
+++ b/packages/graphql-cohttp/graphql-cohttp.0.12.1/opam
@@ -12,7 +12,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.03.0"}
+  "ocaml" {>= "4.06.0"}
   "dune"
   "graphql" {>= "0.9.0"}
   "cohttp" {>= "2.0.0" & < "6.0.0~~"}
diff --git a/packages/graphql-cohttp/graphql-cohttp.0.13.0/opam b/packages/graphql-cohttp/graphql-cohttp.0.13.0/opam
index 7aea1baa189..e10a70c6097 100644
--- a/packages/graphql-cohttp/graphql-cohttp.0.13.0/opam
+++ b/packages/graphql-cohttp/graphql-cohttp.0.13.0/opam
@@ -13,7 +13,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.03.0"}
+  "ocaml" {>= "4.06.0"}
   "dune" {>= "1.1"}
   "graphql" {>= "0.13.0"}
   "cohttp" {>= "2.0.0" & < "6.0.0~~"}