diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 8e2bcd182b3..fff7eb20ab0 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -91,11 +91,11 @@ let
 
   ack = buildPerlPackage {
     pname = "ack";
-    version = "3.3.1";
+    version = "3.4.0";
 
     src = fetchurl {
-      url = "mirror://cpan/authors/id/P/PE/PETDANCE/ack-v3.3.1.tar.gz";
-      sha256 = "12fm9zplyqndji52nb3b5d91z22g8gr61r1k153kjq84kw264fxf";
+      url = "mirror://cpan/authors/id/P/PE/PETDANCE/ack-v3.4.0.tar.gz";
+      sha256 = "0l3bkac2kl1nl5pwmh5b4plyr7wdzf1h501gwkga2ag1p6wxdkvf";
     };
 
     outputs = ["out" "man"];