diff --git a/pkgs/development/libraries/physics/fastjet/default.nix b/pkgs/development/libraries/physics/fastjet/default.nix
index 35ce8dedca74..55d272f405b7 100644
--- a/pkgs/development/libraries/physics/fastjet/default.nix
+++ b/pkgs/development/libraries/physics/fastjet/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "fastjet";
-  version = "3.3.4";
+  version = "3.4.0";
 
   src = fetchurl {
     url = "http://fastjet.fr/repo/fastjet-${version}.tar.gz";
-    sha256 = "00zwvmnp2j79z95n9lgnq67q02bqfgirqla8j9y6jd8k3r052as3";
+    hash = "sha256-7gfIdHyOrYbYjeSp5OjR6efXYUlz9WMbqCl/egJHi5E=";
   };
 
   buildInputs = [ python2 ];