diff --git a/pkgs/tools/archivers/zpaq/default.nix b/pkgs/tools/archivers/zpaq/default.nix
index 6b04fe17268..b26120bcb5c 100644
--- a/pkgs/tools/archivers/zpaq/default.nix
+++ b/pkgs/tools/archivers/zpaq/default.nix
@@ -3,11 +3,11 @@ let
   s = # Generated upstream information
   rec {
     baseName="zpaq";
-    version="625";
+    version="642";
     name="${baseName}-${version}";
-    hash="0d3ly8l6mzbqxkg68yz7mid3dr056fgr5n49rlkjwcfg533c5gwx";
-    url="http://mattmahoney.net/dc/zpaq625.zip";
-    sha256="0d3ly8l6mzbqxkg68yz7mid3dr056fgr5n49rlkjwcfg533c5gwx";
+    hash="020nd5gzzynhccldbf1kh4x1cc3445b7ig2cl30xvxaz16h1r2p5";
+    url="http://mattmahoney.net/dc/zpaq642.zip";
+    sha256="020nd5gzzynhccldbf1kh4x1cc3445b7ig2cl30xvxaz16h1r2p5";
   };
   buildInputs = [
     unzip