diff --git a/pkgs/by-name/pr/pretix/package.nix b/pkgs/by-name/pr/pretix/package.nix
index e6322015943881..7c06eca325e913 100644
--- a/pkgs/by-name/pr/pretix/package.nix
+++ b/pkgs/by-name/pr/pretix/package.nix
@@ -3,6 +3,7 @@
   buildNpmPackage,
   fetchFromGitHub,
   fetchPypi,
+  fetchpatch2,
   nodejs,
   python3,
   gettext,
@@ -78,6 +79,12 @@ python.pkgs.buildPythonApplication rec {
     # Discover pretix.plugin entrypoints during build and add them into
     # INSTALLED_APPS, so that their static files are collected.
     ./plugin-build.patch
+
+    (fetchpatch2 {
+      # fix tests after 2025-01-01
+      url = "https://github.com/pretix/pretix/commit/5a5a551c21461d9ef36337480c9874d65a9fdba9.patch";
+      hash = "sha256-ZtSVI6nVlJtNrnBZ9ktIqFGtNf+oWtvNsgCWwOUwVug=";
+    })
   ];
 
   pythonRelaxDeps = [