diff --git a/packages/owl-base/owl-base.0.7.0/opam b/packages/owl-base/owl-base.0.7.0/opam
index abb95742661..472991c6622 100644
--- a/packages/owl-base/owl-base.0.7.0/opam
+++ b/packages/owl-base/owl-base.0.7.0/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.06.0"}
+  "ocaml" {>= "4.06.0" & < "5.0"}
   "base-bigarray"
   "integers"
   "dune" {>= "1.7.0"}
diff --git a/packages/owl-base/owl-base.0.7.1/opam b/packages/owl-base/owl-base.0.7.1/opam
index 8b7ff0990fe..19365831e2d 100644
--- a/packages/owl-base/owl-base.0.7.1/opam
+++ b/packages/owl-base/owl-base.0.7.1/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.06.0"}
+  "ocaml" {>= "4.06.0" & < "5.0"}
   "base-bigarray"
   "dune" {>= "1.7.0"}
   "stdlib-shims"
diff --git a/packages/owl-base/owl-base.0.7.2/opam b/packages/owl-base/owl-base.0.7.2/opam
index 3e53f578cf6..de484694b79 100644
--- a/packages/owl-base/owl-base.0.7.2/opam
+++ b/packages/owl-base/owl-base.0.7.2/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.06.0"}
+  "ocaml" {>= "4.06.0" & < "5.0"}
   "base-bigarray"
   "dune" {>= "1.7.0"}
   "stdlib-shims"
diff --git a/packages/owl-base/owl-base.0.8.0/opam b/packages/owl-base/owl-base.0.8.0/opam
index fea563d93f4..8a3f27f9bfd 100644
--- a/packages/owl-base/owl-base.0.8.0/opam
+++ b/packages/owl-base/owl-base.0.8.0/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.06.0"}
+  "ocaml" {>= "4.06.0" & < "5.0"}
   "base-bigarray"
   "dune" {>= "2.0.0"}
   "stdlib-shims"
diff --git a/packages/owl-base/owl-base.0.9.0/opam b/packages/owl-base/owl-base.0.9.0/opam
index 1c7a402e7e9..319e17629f5 100644
--- a/packages/owl-base/owl-base.0.9.0/opam
+++ b/packages/owl-base/owl-base.0.9.0/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.10.0"}
+  "ocaml" {>= "4.10.0" & < "5.0"}
   "base-bigarray"
   "dune" {>= "2.0.0"}
   "stdlib-shims"
diff --git a/packages/owl-base/owl-base.1.0.0/opam b/packages/owl-base/owl-base.1.0.0/opam
index 0bc59f01b66..ea6f06676f9 100644
--- a/packages/owl-base/owl-base.1.0.0/opam
+++ b/packages/owl-base/owl-base.1.0.0/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.10.0"}
+  "ocaml" {>= "4.10.0" & < "5.0"}
   "base-bigarray"
   "dune" {>= "2.0.0"}
 ]
diff --git a/packages/owl-base/owl-base.1.0.1/opam b/packages/owl-base/owl-base.1.0.1/opam
index e99676df2ca..73dfb9248f8 100644
--- a/packages/owl-base/owl-base.1.0.1/opam
+++ b/packages/owl-base/owl-base.1.0.1/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.10.0"}
+  "ocaml" {>= "4.10.0" & < "5.0"}
   "base-bigarray"
   "dune" {>= "2.0.0"}
 ]
diff --git a/packages/owl-base/owl-base.1.0.2/opam b/packages/owl-base/owl-base.1.0.2/opam
index 37bcb0bda7d..091d8a22e49 100644
--- a/packages/owl-base/owl-base.1.0.2/opam
+++ b/packages/owl-base/owl-base.1.0.2/opam
@@ -14,7 +14,7 @@ build: [
 ]
 
 depends: [
-  "ocaml" {>= "4.10.0"}
+  "ocaml" {>= "4.10.0" & < "5.0"}
   "base-bigarray"
   "dune" {>= "2.0.0"}
 ]