diff --git a/pkgs/servers/mail/dovecot/plugins/pigeonhole/default.nix b/pkgs/servers/mail/dovecot/plugins/pigeonhole/default.nix
index 92b404d0f65..af9ff3b257b 100644
--- a/pkgs/servers/mail/dovecot/plugins/pigeonhole/default.nix
+++ b/pkgs/servers/mail/dovecot/plugins/pigeonhole/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "dovecot-pigeonhole-${version}";
-  version = "0.5.0.1";
+  version = "0.5.1";
 
   src = fetchurl {
     url = "http://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-${version}.tar.gz";
-    sha256 = "1lpsdqh9pwqx917z5v23bahhhbrcb3y5ps3l413sli8cn4a6sdan";
+    sha256 = "0ivmaxic6cygfphvlrvy0xgggydm7j7kjv1ssfqbr08q4rcsmc73";
   };
 
   buildInputs = [ dovecot openssl ];