diff --git a/packages/albatross.2.0.99~dev/opam b/packages/albatross.2.0.99~dev/opam
index 544575f..fa0e749 100644
--- a/packages/albatross.2.0.99~dev/opam
+++ b/packages/albatross.2.0.99~dev/opam
@@ -7,7 +7,7 @@ bug-reports: "https://github.com/roburio/albatross/issues"
 license: "ISC"
 
 depends: [
-  "ocaml" {>= "4.12.0"}
+  "ocaml" {>= "4.12.0" & < "5.0"}
   "dune" {>= "2.7.0"}
   "dune-configurator"
   "conf-pkg-config" {build}
diff --git a/packages/builder-web.0.2.0~dev/opam b/packages/builder-web.0.2.0~dev/opam
index caca7b4..a3cbbc8 100644
--- a/packages/builder-web.0.2.0~dev/opam
+++ b/packages/builder-web.0.2.0~dev/opam
@@ -15,7 +15,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.13.0"}
+  "ocaml" {>= "4.13.0" & < "5.0.0"}
   "dune" {>= "2.7.0"}
   "builder" {>= "0.2.0"}
   "dream" {= "1.0.0~alpha4"}
diff --git a/packages/builder.0.3.2~dev/opam b/packages/builder.0.3.2~dev/opam
index 33f01f6..70cabfa 100644
--- a/packages/builder.0.3.2~dev/opam
+++ b/packages/builder.0.3.2~dev/opam
@@ -7,7 +7,7 @@ bug-reports: "https://github.com/roburio/builder/issues"
 license: "ISC"
 
 depends: [
-  "ocaml" {>= "4.08.0"}
+  "ocaml" {>= "4.08.0" & < "5.0.0"}
   "dune" {>= "2.0.0"}
   "asn1-combinators"
   "bheap" {>= "2.0.0"}
diff --git a/packages/orb.0.0.2~dev/opam b/packages/orb.0.0.2~dev/opam
index c26bd09..456e097 100644
--- a/packages/orb.0.0.2~dev/opam
+++ b/packages/orb.0.0.2~dev/opam
@@ -6,7 +6,7 @@ homepage: "https://github.com/roburio/orb"
 bug-reports: "https://github.com/roburio/orb/issues"
 license: "LGPL-2.1-only WITH OCaml-LGPL-linking-exception"
 depends: [
-  "ocaml" {>= "4.10.0"}
+  "ocaml" {>= "4.10.0" & < "5.0.0"}
   "dune" {>= "2.0"}
   "cmdliner" {>= "1.1.0"}
   "opam-client" {>= "2.1.2"}