diff --git a/pkgs/development/ocaml-modules/camlpdf/default.nix b/pkgs/development/ocaml-modules/camlpdf/default.nix
index f496ce91c826..3d79fa377a53 100644
--- a/pkgs/development/ocaml-modules/camlpdf/default.nix
+++ b/pkgs/development/ocaml-modules/camlpdf/default.nix
@@ -1,17 +1,17 @@
 { lib, stdenv, fetchFromGitHub, which, ocaml, findlib }:
 
-if !lib.versionAtLeast ocaml.version "4.02"
+if !lib.versionAtLeast ocaml.version "4.10"
 then throw "camlpdf is not available for OCaml ${ocaml.version}"
 else
 
 stdenv.mkDerivation rec {
-  version = "2.4";
+  version = "2.5";
   name = "ocaml${ocaml.version}-camlpdf-${version}";
   src = fetchFromGitHub {
     owner = "johnwhitington";
     repo = "camlpdf";
     rev = "v${version}";
-    sha256 = "09kzrgmlxb567315p3fy59ba0kv7xhp548n9i3l4wf9n06p0ww9m";
+    sha256 = "sha256:1qmsa0xgi960y7r20mvf8hxiiml7l1908s4dm7nq262f19w51gsl";
   };
 
   buildInputs = [ which ocaml findlib ];
diff --git a/pkgs/development/ocaml-modules/cpdf/default.nix b/pkgs/development/ocaml-modules/cpdf/default.nix
index 2a0fae4a1dbb..d86c0d093247 100644
--- a/pkgs/development/ocaml-modules/cpdf/default.nix
+++ b/pkgs/development/ocaml-modules/cpdf/default.nix
@@ -4,7 +4,7 @@ if !lib.versionAtLeast ocaml.version "4.10"
 then throw "cpdf is not available for OCaml ${ocaml.version}"
 else
 
-let version = "2.4"; in
+let version = "2.5"; in
 
 stdenv.mkDerivation {
   name = "ocaml${ocaml.version}-cpdf-${version}";
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
     owner = "johnwhitington";
     repo = "cpdf-source";
     rev = "v${version}";
-    sha256 = "1a8lmfc76dr8x6pxgm4aypbys02pfma9yh4z3l1qxp2q1909na5l";
+    sha256 = "sha256:0ps6d78i5mp1gcigxfp9rxmjr1k00nkr37vllhr0rdyph97w41s1";
   };
 
   buildInputs = [ ocaml findlib ncurses ];