diff --git a/pkgs/servers/mail/mailman/postorius.nix b/pkgs/servers/mail/mailman/postorius.nix
index 57df52d0a0a6..4022b6fe91c9 100644
--- a/pkgs/servers/mail/mailman/postorius.nix
+++ b/pkgs/servers/mail/mailman/postorius.nix
@@ -6,11 +6,11 @@ buildPythonPackage rec {
   pname = "postorius";
   # Note: Mailman core must be on the latest version before upgrading Postorious.
   # See: https://gitlab.com/mailman/postorius/-/issues/516#note_544571309
-  version = "1.3.5";
+  version = "1.3.6";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0f23c6542bf0f6e6364d678c094ee5804acfe59ecbcc0e944bc4c13834e24e80";
+    sha256 = "sha256-KwzEU9IfcQ6YPZu3jPuFrd6ux/3e2pzoLfTrak/aGmg=";
   };
 
   propagatedBuildInputs = [ django-mailman3 readme_renderer ];