diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 5dc5fd58afb..59824f0d54e 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -867,10 +867,10 @@ let self = _self // overrides; _self = with self; {
   };
 
   CacheFastMmap = buildPerlPackage rec {
-    name = "Cache-FastMmap-1.43";
+    name = "Cache-FastMmap-1.46";
     src = fetchurl {
-      url = "mirror://cpan/modules/by-module/Cache/${name}.tar.gz";
-      sha256 = "18k10bhi67iyy8igw8hwb339miwscgnsh9y2pbncw6gdr2b610vi";
+      url = mirror://cpan/authors/id/R/RO/ROBM/Cache-FastMmap-1.46.tar.gz;
+      sha256 = "0061kwlbv398b2hb0kx1r6lmqf4kb6dnq9j4lsikczyk981sxs98";
     };
   };