diff --git a/pkgs/development/ocaml-modules/x509/default.nix b/pkgs/development/ocaml-modules/x509/default.nix
index 6fdbbc346d92..0d9b657969d1 100644
--- a/pkgs/development/ocaml-modules/x509/default.nix
+++ b/pkgs/development/ocaml-modules/x509/default.nix
@@ -1,13 +1,13 @@
 { stdenv, fetchzip, ocaml, findlib, asn1-combinators, nocrypto, ounit }:
 
-let version = "0.4.0"; in
+let version = "0.5.0"; in
 
 stdenv.mkDerivation {
   name = "ocaml-x509-${version}";
 
   src = fetchzip {
     url = "https://github.com/mirleft/ocaml-x509/archive/${version}.tar.gz";
-    sha256 = "0z4c19y625ipx2anpq25pzly1fdi3cklhk130kriybrczvmd2b29";
+    sha256 = "0i9618ph4i2yk5dvvhiqhm7wf3qmd6b795mxwff8jf856gb2gdyn";
   };
 
   buildInputs = [ ocaml findlib ounit ];