diff --git a/pkgs/development/compilers/zz/default.nix b/pkgs/development/compilers/zz/default.nix
index 273873c88017..3f77c49f5561 100644
--- a/pkgs/development/compilers/zz/default.nix
+++ b/pkgs/development/compilers/zz/default.nix
@@ -2,18 +2,19 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "zz";
-  version = "0.1";
+  version = "unstable-2021-01-26";
 
+  # commit chosen by using the latest build from http://bin.zetz.it/
   src = fetchFromGitHub {
     owner = "aep";
     repo = "zz";
-    rev = version;
-    sha256 = "0kqrfm2r9wn0p2c3lcprsy03p9qhrwjs990va8qi59jp704l84ad";
+    rev = "0b5c52674e9adf795fbfb051d4dceef3126e669f";
+    sha256 = "0bb77ll1g5i6a04ybpgx6lqsb74xs4v4nyqm9j4j6x24407h8l89";
   };
 
   nativeBuildInputs = [ makeWrapper ];
 
-  cargoSha256 = "0yllcqxyyhwr9h0z8q84l0ms8x6jrqhpg79ik4xng6h5yf4ab0pq";
+  cargoSha256 = "1lf4k3n89w2797c1yrj1dp97y8a8d5hnixr1nwa2qcq1sxmm5rcg";
 
   postInstall = ''
     wrapProgram $out/bin/zz --prefix PATH ":" "${lib.getBin z3}/bin"