diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a23b14f..8562acd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
           # Either the waiting queue for FreeBSD is very long, or it is not available.
           # - freebsd-latest
         ocaml-compiler:
-          - 4.12.x
+          - 4.13.x
           # - 5.1.x
           - 5.2.x
     runs-on: ${{ matrix.os }}
diff --git a/cudajit.opam b/cudajit.opam
index 1b7fb74..9158452 100644
--- a/cudajit.opam
+++ b/cudajit.opam
@@ -13,7 +13,7 @@ homepage: "https://github.com/lukstafi/ocaml-cudajit"
 doc: "https://github.com/lukstafi/ocaml-cudajit/blob/master/README.md"
 bug-reports: "https://github.com/lukstafi/ocaml-cudajit/issues"
 depends: [
-  "ocaml" {>= "4.12"}
+  "ocaml" {>= "4.13"}
   "dune" {>= "3.11"}
   "ctypes" {>= "0.14.0"}
   "ctypes-foreign"
diff --git a/dune-project b/dune-project
index a9f90a4..5750b01 100644
--- a/dune-project
+++ b/dune-project
@@ -28,7 +28,7 @@
   "Bindings to manually selected parts of `lcuda` and `lnvrtc`, with a few types and conversion functions to facilitate use.")
  (depends
   (ocaml
-   (>= 4.12))
+   (>= 4.13))
   dune
   (ctypes
    (>= 0.14.0))