diff --git a/nur.nix b/nur.nix
index 3cf24d3..43e2100 100644
--- a/nur.nix
+++ b/nur.nix
@@ -27,7 +27,21 @@ rec {
   ch57x-keyboard-tool = pkgs.callPackage ./packages/ch57x-keyboard-tool.nix { };
   co2monitor = pkgs.callPackage ./packages/co2monitor.nix { };
   decompiler-mc = pkgs.callPackage ./packages/decompiler-mc.nix { };
-  dmarc-report-notifier = pkgs.callPackage ./packages/dmarc-report-notifier.nix { };
+  dmarc-report-notifier = pkgs.callPackage ./packages/dmarc-report-notifier.nix (
+    # Dependency pkgs.python3Packages.parsedmarc was broken on 2024-03-12 by
+    # NixOS/nixpkgs#294305. A workaround was subsequently applied to dependent
+    # pkgs.parsedmarc in NixOS/nixpkgs#280940 but the library remains broken, so
+    # here we duplicate the workaround.
+    pkgs.lib.optionalAttrs (pkgs.lib.versionAtLeast pkgs.lib.trivial.release "24.05") {
+      python3Packages = pkgs.lib.throwIfNot pkgs.python3Packages.parsedmarc.meta.broken
+        "python3Packages.parsedmarc is no longer broken"
+        (pkgs.python3.override {
+          packageOverrides = _: _: {
+            msgraph-core = pkgs.lib.findFirst (p: p.pname == "msgraph-core") null pkgs.parsedmarc.requiredPythonModules;
+          };
+        }).pkgs;
+    }
+  );
   fastnbt-tools = pkgs.callPackage ./packages/fastnbt-tools.nix { };
   fediblockhole = pkgs.callPackage ./packages/fediblockhole.nix { };
   git-diff-image = pkgs.callPackage ./packages/git-diff-image.nix { };