diff --git a/pkgs/development/libraries/physics/pythia/default.nix b/pkgs/development/libraries/physics/pythia/default.nix
index 1bec3300f80a..48fc95e788a5 100644
--- a/pkgs/development/libraries/physics/pythia/default.nix
+++ b/pkgs/development/libraries/physics/pythia/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "pythia";
-  version = "8.303";
+  version = "8.304";
 
   src = fetchurl {
     url = "http://home.thep.lu.se/~torbjorn/pythia8/pythia${builtins.replaceStrings ["."] [""] version}.tgz";
-    sha256 = "0gli6zf8931i7kyminppisc9d0q69xxnalvhld5fgnkh4q82nz6d";
+    sha256 = "18frx7xyvxnz57fxjncjyjzsk169h0jz6hxzjfpmwm3dzcc712fk";
   };
 
   buildInputs = [ boost fastjet hepmc zlib rsync lhapdf ];