diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 22caacdeb77..1d4908fb25d 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -587,14 +587,15 @@ let self = _self // overrides; _self = with self; {
   };
 
   bignum = buildPerlPackage rec {
-    name = "bignum-0.41";
+    name = "bignum-0.42";
     src = fetchurl {
       url = "mirror://cpan/authors/id/P/PJ/PJACKLAM/${name}.tar.gz";
-      sha256 = "19bwz2yi2qf5lrhkkk8c320b5ixn0wl8662gmvq3gqzarngxf76l";
+      sha256 = "5bc9a16fe6d56584cde0f183828d81466f2cfc08ec1b6ef15d25a732080a9b52";
     };
+    buildInputs = [ MathBigInt MathBigRat ];
     meta = {
       description = "Transparent BigNumber support for Perl";
-      license = "perl";
+      license = with stdenv.lib.licenses; [ artistic1 gpl1Plus ];
     };
   };