diff --git a/pkgs/misc/nix-unstable/default.nix b/pkgs/misc/nix-unstable/default.nix
index 608a7638d131..1e2b83b41e03 100644
--- a/pkgs/misc/nix-unstable/default.nix
+++ b/pkgs/misc/nix-unstable/default.nix
@@ -8,11 +8,11 @@ assert aterm != null && bdb != null && perl != null;
 # assert aterm.version >= 2.0
 
 stdenv.mkDerivation {
-  name = "nix-0.10pre5896";
+  name = "nix-0.10pre6047";
   builder = ./builder.sh;
   src = fetchurl {
-    url = http://nix.cs.uu.nl/dist/nix/nix-0.10pre5896/nix-0.10pre5896.tar.bz2;
-    md5 = "509d4a452cbf2894a86184b5eaf45abd";
+    url = http://nix.cs.uu.nl/dist/nix/nix-0.10pre6047/nix-0.10pre6047.tar.bz2;
+    md5 = "40f68dd3555dbb12478a468df301c3a9";
   };
   buildInputs = [aterm bdb perl curl];
   inherit storeDir stateDir aterm bdb;
@@ -20,5 +20,5 @@ stdenv.mkDerivation {
   # uncomment if you want to be able to use nix-prefetch-url when NIX_ROOT
   # is set
   #patches = [./nix-0.10pre5679.patch];
-  patches = [./nix-0.10pre5896-date.patch ./nix-0.10pre5896-paths.patch ./nix-0.10pre5896-chroot-once.patch];
+  patches = [./nix-0.10pre5896-paths.patch ./nix-0.10pre5896-chroot-once.patch];
 }
diff --git a/pkgs/misc/nix-unstable/nix-0.10pre5896-date.patch b/pkgs/misc/nix-unstable/nix-0.10pre5896-date.patch
deleted file mode 100644
index 7b8012ae2852..000000000000
--- a/pkgs/misc/nix-unstable/nix-0.10pre5896-date.patch
+++ /dev/null
@@ -1,20 +0,0 @@
-diff -rc nix-0.10pre5896/scripts/download-using-manifests.pl.in nix-0.10pre5896.new/scripts/download-using-manifests.pl.in
-*** nix-0.10pre5896/scripts/download-using-manifests.pl.in	2006-07-24 20:39:47.000000000 +0200
---- nix-0.10pre5896.new/scripts/download-using-manifests.pl.in	2006-08-02 18:06:53.000000000 +0200
-***************
-*** 27,33 ****
-  die unless scalar @ARGV == 1;
-  my $targetPath = $ARGV[0];
-  
-! my $date = `date` or die;
-  chomp $date;
-  print LOGFILE "$$ get $targetPath $date\n";
-  
---- 27,33 ----
-  die unless scalar @ARGV == 1;
-  my $targetPath = $ARGV[0];
-  
-! my $date = `@coreutils@/date` or die;
-  chomp $date;
-  print LOGFILE "$$ get $targetPath $date\n";
-