diff --git a/pkgs/development/ocaml-modules/alcotest/default.nix b/pkgs/development/ocaml-modules/alcotest/default.nix
index dddf79fa741e..7dd1a2b0d0ae 100644
--- a/pkgs/development/ocaml-modules/alcotest/default.nix
+++ b/pkgs/development/ocaml-modules/alcotest/default.nix
@@ -13,11 +13,11 @@
 
 buildDunePackage rec {
   pname = "alcotest";
-  version = "1.8.0";
+  version = "1.9.0";
 
   src = fetchurl {
     url = "https://github.com/mirage/alcotest/releases/download/${version}/alcotest-${version}.tbz";
-    hash = "sha256-y6G9AXB8jFW0dkuw34yccyvjIeHxwalqQG5W2NvKHQ4=";
+    hash = "sha256-4jhxNsqFTfK0FSE53U1LOVOmRugElIBz3t/gojLwihU=";
   };
 
   nativeBuildInputs = [ ocaml-syntax-shims ];