diff --git a/nix/challenge-bypass-ristretto-repo.nix b/nix/challenge-bypass-ristretto-repo.nix
index 78c4d072bd344e280d5b4a1bf8392fedeb9de5c3..1357efe3e9ab3c9480109c7a52864f751d9bfdc3 100644
--- a/nix/challenge-bypass-ristretto-repo.nix
+++ b/nix/challenge-bypass-ristretto-repo.nix
@@ -4,6 +4,6 @@ in
   pkgs.fetchFromGitHub {
     owner = "LeastAuthority";
     repo = "python-challenge-bypass-ristretto";
-    rev = "0c4af863a7485bb99523c4f5ee978ec6699d78e3";
+    rev = "v2021.07.12";
     sha256 = "16af1qmx7srhvcc936x7hl2bz50hafm39311dbzqam9ms1i5q89j";
-  }
\ No newline at end of file
+  }