diff --git a/pkgs/development/tools/ocaml/cppo/default.nix b/pkgs/development/tools/ocaml/cppo/default.nix
index 3134c310c453..753ef0a836b9 100644
--- a/pkgs/development/tools/ocaml/cppo/default.nix
+++ b/pkgs/development/tools/ocaml/cppo/default.nix
@@ -21,7 +21,7 @@ if lib.versionAtLeast ocaml.version "4.02" then
 
 buildDunePackage rec {
   inherit pname;
-  version = "1.6.8";
+  version = "1.6.9";
 
   useDune2 = true;
 
@@ -29,7 +29,7 @@ buildDunePackage rec {
     owner = "ocaml-community";
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256:0xjb1dnj8lvdcccskrhrakknd9q4vfy5330sjbqpf4h95dsz90k9";
+    sha256 = "sha256-NdN2QnVRfRq9hEcSAnO2Wha7icDlf2Zg4JQqoEWmErE=";
   };
 
   doCheck = true;