diff --git a/pkgs/development/libraries/physics/clhep/default.nix b/pkgs/development/libraries/physics/clhep/default.nix
index a7c38ce3f0f9..a8d853a23b04 100644
--- a/pkgs/development/libraries/physics/clhep/default.nix
+++ b/pkgs/development/libraries/physics/clhep/default.nix
@@ -6,11 +6,11 @@
 
 stdenv.mkDerivation rec {
   pname = "clhep";
-  version = "2.4.6.2";
+  version = "2.4.6.3";
 
   src = fetchurl {
     url = "https://proj-clhep.web.cern.ch/proj-clhep/dist1/clhep-${version}.tgz";
-    hash = "sha256-re1z5JushaW06G9koO49bzz+VVGw93MceLbY+drG6Nw=";
+    hash = "sha256-/NAH8RsQukryjQJyIrYxSNDrRP96CC7uNTvfkh+caEo=";
   };
 
   prePatch = ''