diff --git a/packages/dkml-install-runner/dkml-install-runner.0.1.0/opam b/packages/dkml-install-runner/dkml-install-runner.0.1.0/opam
index 3387b7851db..61888d124ee 100644
--- a/packages/dkml-install-runner/dkml-install-runner.0.1.0/opam
+++ b/packages/dkml-install-runner/dkml-install-runner.0.1.0/opam
@@ -8,6 +8,7 @@ license: "Apache-2.0"
 homepage: "https://github.com/diskuv/dkml-install-api"
 bug-reports: "https://github.com/diskuv/dkml-install-api/issues"
 depends: [
+  "ocaml" {>= "4.09" & < "5.1"}
   "alcotest" {>= "1.4.0" & with-test}
   "odoc" {>= "1.5.3" & with-doc}
   "dkml-install" {= version}
diff --git a/packages/dkml-install-runner/dkml-install-runner.0.2.0/opam b/packages/dkml-install-runner/dkml-install-runner.0.2.0/opam
index 593736d4463..2f3fb3f65ce 100644
--- a/packages/dkml-install-runner/dkml-install-runner.0.2.0/opam
+++ b/packages/dkml-install-runner/dkml-install-runner.0.2.0/opam
@@ -13,6 +13,7 @@ bug-reports: "https://github.com/diskuv/dkml-install-api/issues"
 #   https://github.com/diskuv/dkml-install-api/blob/5cfd7b57c79d990c76a9bdc8f8f0fa9f6fd5346f/runner/src/ocaml_abi.ml
 available: os = "win32" | os = "linux" | os = "macos"
 depends: [
+  "ocaml" {>= "4.09" & < "5.1"}
   "alcotest" {>= "1.4.0" & with-test}
   "odoc" {>= "1.5.3" & with-doc}
   "dkml-install" {= version}
diff --git a/packages/dkml-install-runner/dkml-install-runner.0.3.0/opam b/packages/dkml-install-runner/dkml-install-runner.0.3.0/opam
index 587687ccf32..aefc9a216c8 100644
--- a/packages/dkml-install-runner/dkml-install-runner.0.3.0/opam
+++ b/packages/dkml-install-runner/dkml-install-runner.0.3.0/opam
@@ -13,6 +13,7 @@ bug-reports: "https://github.com/diskuv/dkml-install-api/issues"
 #   https://github.com/diskuv/dkml-install-api/blob/5cfd7b57c79d990c76a9bdc8f8f0fa9f6fd5346f/runner/src/ocaml_abi.ml
 available: os = "win32" | os = "linux" | os = "macos"
 depends: [
+  "ocaml" {>= "4.09" & < "5.1"}
   "alcotest" {>= "1.4.0" & with-test}
   "odoc" {>= "1.5.3" & with-doc}
   "dkml-install" {= version}
diff --git a/packages/dkml-install-runner/dkml-install-runner.0.3.1/opam b/packages/dkml-install-runner/dkml-install-runner.0.3.1/opam
index e9bc5dc1a95..cbfb4bd21a1 100644
--- a/packages/dkml-install-runner/dkml-install-runner.0.3.1/opam
+++ b/packages/dkml-install-runner/dkml-install-runner.0.3.1/opam
@@ -13,6 +13,7 @@ bug-reports: "https://github.com/diskuv/dkml-install-api/issues"
 #   https://github.com/diskuv/dkml-install-api/blob/5cfd7b57c79d990c76a9bdc8f8f0fa9f6fd5346f/runner/src/ocaml_abi.ml
 available: os = "win32" | os = "linux" | os = "macos"
 depends: [
+  "ocaml" {>= "4.10" & < "5.1"}
   "alcotest" {>= "1.4.0" & with-test}
   "odoc" {>= "1.5.3" & with-doc}
   "dkml-install" {= version}
diff --git a/packages/dkml-install-runner/dkml-install-runner.0.4.0/opam b/packages/dkml-install-runner/dkml-install-runner.0.4.0/opam
index 77ad2421236..97f1b19a83c 100644
--- a/packages/dkml-install-runner/dkml-install-runner.0.4.0/opam
+++ b/packages/dkml-install-runner/dkml-install-runner.0.4.0/opam
@@ -8,6 +8,7 @@ license: "Apache-2.0"
 homepage: "https://github.com/diskuv/dkml-install-api"
 bug-reports: "https://github.com/diskuv/dkml-install-api/issues"
 depends: [
+  "ocaml" {>= "4.10"}
   "alcotest" {>= "1.4.0" & with-test}
   "odoc" {>= "1.5.3" & with-doc}
   "dkml-install" {= version}
@@ -45,4 +46,4 @@ url {
     "md5=1b3f42a06b0643eb502e6f65d1769b98"
     "sha512=55d47cb8c570f3e9fbdb5f4f7960c86fbe357df6c5364c82c9eb326150693fa1dbffe3fa3f5682e355f770c5f3c53bd7ce88ec1d1d9eefecceb8f44ed8b1d326"
   ]
-}
\ No newline at end of file
+}
diff --git a/packages/dkml-install-runner/dkml-install-runner.0.5.1/opam b/packages/dkml-install-runner/dkml-install-runner.0.5.1/opam
index 5ddd33c7854..4a409560ee3 100644
--- a/packages/dkml-install-runner/dkml-install-runner.0.5.1/opam
+++ b/packages/dkml-install-runner/dkml-install-runner.0.5.1/opam
@@ -8,6 +8,7 @@ license: "Apache-2.0"
 homepage: "https://github.com/diskuv/dkml-install-api"
 bug-reports: "https://github.com/diskuv/dkml-install-api/issues"
 depends: [
+  "ocaml" {>= "4.10"}
   "dune" {>= "2.9"}
   "alcotest" {>= "1.4.0" & with-test}
   "dkml-install" {= version}
@@ -45,4 +46,4 @@ url {
     "md5=4636532b5971d7aa058b492448b02908"
     "sha512=66e28e6c47b3de638601f0002289849d9af6bcbb9a2eb816d1dfe640bf3e5a350ad16b99d88b474b7be2482de480b5dd1fad4dbf87c702ee421bc033a3ca1327"
   ]
-}
\ No newline at end of file
+}