diff --git a/pkgs/development/compilers/ocaml/4.13.nix b/pkgs/development/compilers/ocaml/4.13.nix
index 008d2cd6d075..723b597b88dc 100644
--- a/pkgs/development/compilers/ocaml/4.13.nix
+++ b/pkgs/development/compilers/ocaml/4.13.nix
@@ -1,9 +1,9 @@
 import ./generic.nix {
   major_version = "4";
   minor_version = "13";
-  patch_version = "0-alpha2";
+  patch_version = "0-beta1";
   src = fetchTarball {
-    url = "https://caml.inria.fr/pub/distrib/ocaml-4.13/ocaml-4.13.0~alpha2.tar.xz";
-    sha256 = "0krb0254i6ihbymjn6mwgzcfrzsvpk9hbagl0agm6wml21zpcsif";
+    url = "https://caml.inria.fr/pub/distrib/ocaml-4.13/ocaml-4.13.0~beta1.tar.xz";
+    sha256 = "0dbz69p1kqabjvzaasy2malfdfn4b93s504x2xs0dl5l3fa3p6c3";
   };
 }