diff --git a/pkgs/development/ocaml-modules/piqi-ocaml/default.nix b/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
index 2d94272e6eb3..488a13ecf161 100644
--- a/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
+++ b/pkgs/development/ocaml-modules/piqi-ocaml/default.nix
@@ -1,12 +1,12 @@
 {stdenv, fetchurl, ocaml, findlib, piqi, ulex, easy-format, xmlm, base64, camlp4}:
 
 stdenv.mkDerivation rec {
-  version = "0.7.4";
+  version = "0.7.5";
   name    = "piqi-ocaml-${version}";
 
   src = fetchurl {
     url = "https://github.com/alavrik/piqi-ocaml/archive/v${version}.tar.gz";
-    sha256 = "064c74f031l847q6s1vilj77n7h7i84jn8c83yid9nha3dssaf7m";
+    sha256 = "0ngz6y8i98i5v2ma8nk6mc83pdsmf2z0ks7m3xi6clfg3zqbddrv";
   };
 
   buildInputs = [ocaml findlib piqi base64 camlp4];
diff --git a/pkgs/development/ocaml-modules/piqi/default.nix b/pkgs/development/ocaml-modules/piqi/default.nix
index 20ce994c0a48..273cd8f1862c 100644
--- a/pkgs/development/ocaml-modules/piqi/default.nix
+++ b/pkgs/development/ocaml-modules/piqi/default.nix
@@ -1,12 +1,12 @@
 {stdenv, fetchurl, ocaml, findlib, camlp4, which, ulex, easy-format, ocaml_optcomp, xmlm, base64}:
 
 stdenv.mkDerivation rec {
-  version = "0.6.12";
+  version = "0.6.13";
   name    = "piqi-${version}";
  
   src = fetchurl {
     url = "https://github.com/alavrik/piqi/archive/v${version}.tar.gz";
-    sha256 = "1ifnawnblvibf5rgp6gr4f20266dckfrlryikg1iiq3dx2wfl7f8";
+    sha256 = "1whqr2bb3gds2zmrzqnv8vqka9928w4lx6mi6g244kmbwb2h8d8l";
   };
 
   buildInputs = [ocaml findlib camlp4 which ocaml_optcomp base64];