diff --git a/pkgs/development/ocaml-modules/camlpdf/default.nix b/pkgs/development/ocaml-modules/camlpdf/default.nix
index a98d7a5e085c..1fcfcaffccdd 100644
--- a/pkgs/development/ocaml-modules/camlpdf/default.nix
+++ b/pkgs/development/ocaml-modules/camlpdf/default.nix
@@ -7,14 +7,14 @@
 }:
 
 stdenv.mkDerivation (finalAttrs: {
-  version = "2.8.1";
+  version = "2.9";
   pname = "ocaml${ocaml.version}-camlpdf";
 
   src = fetchFromGitHub {
     owner = "johnwhitington";
     repo = "camlpdf";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-ZExQtcFBPiS7c6v+WEjZYQ6zXtqRTNLV0hYzYSB/eLE=";
+    hash = "sha256-8xBna7GDFbFf48069/ct71uFxLJU0eBfKVRWDnyYocs=";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/development/ocaml-modules/cpdf/default.nix b/pkgs/development/ocaml-modules/cpdf/default.nix
index 7b4141113d60..8c46a09ca583 100644
--- a/pkgs/development/ocaml-modules/cpdf/default.nix
+++ b/pkgs/development/ocaml-modules/cpdf/default.nix
@@ -9,13 +9,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "ocaml${ocaml.version}-cpdf";
-  version = "2.8.1";
+  version = "2.9";
 
   src = fetchFromGitHub {
     owner = "johnwhitington";
     repo = "cpdf-source";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-MK48ajZmpXibbaJ4x2vaHhh2N+OBRqj7zT8eaVenxDY=";
+    hash = "sha256-b6fGKFM9Q2YxW8FoyewGNTkF9XBtjdq0Bur6KgVi5T4=";
   };
 
   nativeBuildInputs = [