diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 30c5fc6..74f9093 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -112,12 +112,12 @@ in rec {

   nixUnstable = lib.lowPrio (common rec {
     name = "nix-1.12${suffix}";
-    suffix = "pre4911_b30d1e7";
+    suffix = "pre4933_3a4bd32";
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "nix";
-      rev = "b30d1e7ada0a8fbaacc25e24e5e788d18bfe8d3c";
-      sha256 = "04j6aw2bi3k7m5jyqwn1vrf78br5kdfpjsj15b5r5lvxdqhlknvm";
+      rev = "3a4bd320c2c4043a4b1f73406030e9afc0677b59";
+      sha256 = "1dhn8i7bm8g7ndb4kbc7iiy1ky6z9ingcj0j3is9hsxf9dfnfyyf";
     };
     fromGit = true;
   });