diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 22bb6acf81d..e8bb59edff9 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -716,10 +716,10 @@ let self = _self // overrides; _self = with self; {
   };
 
   bignum = buildPerlPackage rec {
-    name = "bignum-0.47";
+    name = "bignum-0.49";
     src = fetchurl {
       url = "mirror://cpan/authors/id/P/PJ/PJACKLAM/${name}.tar.gz";
-      sha256 = "b084eac6d676d2acc4d60deed58e6e31b2f572b7b0be1aec9b93be92bad8261a";
+      sha256 = "28685b271251927d327851e5951e38649524a4e50cb0d1d35d649e2b814f212d";
     };
     buildInputs = [ MathBigInt MathBigRat ];
     meta = {