diff --git a/pkgs/applications/version-management/monotone-viz/default.nix b/pkgs/applications/version-management/monotone-viz/default.nix
deleted file mode 100644
index 5f43c165dcba..000000000000
--- a/pkgs/applications/version-management/monotone-viz/default.nix
+++ /dev/null
@@ -1,105 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchurl,
-  fetchpatch,
-  ocamlPackages,
-  gnome2,
-  pkg-config,
-  makeWrapper,
-  glib,
-  libtool,
-  libpng,
-  bison,
-  expat,
-  fontconfig,
-  gd,
-  pango,
-  libjpeg,
-  libwebp,
-  libX11,
-  libXaw,
-}:
-# We need an old version of Graphviz for format compatibility reasons.
-# This version is vulnerable, but monotone-viz will never feed it bad input.
-let
-  graphviz_2_0 = import ./graphviz-2.0.nix {
-    inherit
-      lib
-      stdenv
-      fetchurl
-      pkg-config
-      libX11
-      libpng
-      libjpeg
-      expat
-      libXaw
-      bison
-      libtool
-      fontconfig
-      pango
-      gd
-      libwebp
-      ;
-  };
-in
-let
-  inherit (gnome2) libgnomecanvas;
-in
-let
-  inherit (ocamlPackages) ocaml lablgtk camlp4;
-in
-stdenv.mkDerivation rec {
-  version = "1.0.2";
-  pname = "monotone-viz";
-
-  nativeBuildInputs = [
-    pkg-config
-    makeWrapper
-    ocaml
-    camlp4
-  ];
-  buildInputs = [
-    lablgtk
-    libgnomecanvas
-    glib
-    graphviz_2_0
-  ];
-  src = fetchurl {
-    url = "http://oandrieu.nerim.net/monotone-viz/${pname}-${version}-nolablgtk.tar.gz";
-    sha256 = "1l5x4xqz5g1aaqbc1x80mg0yzkiah9ma9k9mivmn08alkjlakkdk";
-  };
-
-  prePatch = "ln -s . a; ln -s . b";
-  patchFlags = [ "-p0" ];
-  patches = [
-    (fetchpatch {
-      url = "https://src.fedoraproject.org/rpms/monotone-viz/raw/c9f4c1bebe01bb471df05d8a37ca4b6d630574ec/f/monotone-viz-1.0.2-dot.patch";
-      hash = "sha256-e348703+IzM4m/3cpe6Z9VebZgTK8+3lRLdaTfXHwSI=";
-    })
-    (fetchpatch {
-      url = "https://src.fedoraproject.org/rpms/monotone-viz/raw/c9f4c1bebe01bb471df05d8a37ca4b6d630574ec/f/monotone-viz-1.0.2-new-stdio.patch";
-      hash = "sha256-9xQzJ+oYz06fDFOe1YOOisEZnwiwShqr2Rt7IXiu6Zo=";
-    })
-    (fetchpatch {
-      url = "https://src.fedoraproject.org/rpms/monotone-viz/raw/c9f4c1bebe01bb471df05d8a37ca4b6d630574ec/f/monotone-viz-1.0.2-typefix.patch";
-      hash = "sha256-52VGXDJKx4ZGvZRO8QCXdTGsWR0m1pqQnEOby7PMQdg=";
-    })
-  ];
-
-  preConfigure = ''
-    appendToVar configureFlags "--with-lablgtk-dir=$(echo ${lablgtk}/lib/ocaml/*/site-lib/lablgtk2)"
-  '';
-
-  postInstall = ''
-    wrapProgram "$out/bin/monotone-viz" --prefix PATH : "${graphviz_2_0}/bin/"
-  '';
-
-  meta = {
-    description = "Monotone ancestry visualiser";
-    mainProgram = "monotone-viz";
-    license = lib.licenses.gpl2Plus;
-    maintainers = [ lib.maintainers.raskin ];
-    platforms = lib.platforms.linux;
-  };
-}
diff --git a/pkgs/applications/version-management/monotone-viz/graphviz-2.0.nix b/pkgs/applications/version-management/monotone-viz/graphviz-2.0.nix
deleted file mode 100644
index 88fa657da437..000000000000
--- a/pkgs/applications/version-management/monotone-viz/graphviz-2.0.nix
+++ /dev/null
@@ -1,66 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchurl,
-  pkg-config,
-  libX11,
-  libpng,
-  libjpeg,
-  expat,
-  libXaw,
-  bison,
-  libtool,
-  fontconfig,
-  pango,
-  gd,
-  libwebp,
-}:
-
-stdenv.mkDerivation rec {
-  pname = "graphviz";
-  version = "2.0";
-
-  src = fetchurl {
-    url = "http://www.graphviz.org/pub/graphviz/ARCHIVE/graphviz-${version}.tar.gz";
-    sha256 = "39b8e1f2ba4cc1f5bdc8e39c7be35e5f831253008e4ee2c176984f080416676c";
-  };
-
-  nativeBuildInputs = [ pkg-config ];
-  buildInputs = [
-    libX11
-    libpng
-    libjpeg
-    expat
-    libXaw
-    bison
-    libtool
-    fontconfig
-    pango
-    gd
-    libwebp
-  ];
-
-  hardeningDisable = [
-    "format"
-    "fortify"
-  ];
-
-  configureFlags = [
-    "--with-pngincludedir=${libpng.dev}/include"
-    "--with-pnglibdir=${libpng.out}/lib"
-    "--with-jpegincludedir=${libjpeg.dev}/include"
-    "--with-jpeglibdir=${libjpeg.out}/lib"
-    "--with-expatincludedir=${expat.dev}/include"
-    "--with-expatlibdir=${expat.out}/lib"
-    "--with-ltdl-include=${libtool}/include"
-    "--with-ltdl-lib=${libtool.lib}/lib"
-  ]
-  ++ lib.optional (libX11 == null) "--without-x";
-
-  meta = {
-    description = "Program for visualising graphs";
-    homepage = "http://www.graphviz.org/";
-    branch = "2.0";
-    platforms = lib.platforms.unix;
-  };
-}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 8c44e054b5da..c6286ab8bdbe 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -1781,6 +1781,7 @@ mapAliases {
   mongodb-4_4 = throw "mongodb-4_4 has been removed, it's end of life since April 2024"; # Added 2024-04-11
   mongodb-5_0 = throw "mongodb-5_0 has been removed, it's end of life since October 2024"; # Added 2024-10-01
   mongodb-6_0 = throw "mongodb-6_0 has been removed, it's end of life since July 2025"; # Added 2025-07-23
+  monotoneViz = throw "monotoneViz was removed because it relies on a broken version of graphviz"; # added 2025-10-19
   moralerspace-nf = throw "moralerspace-nf has been removed, use moralerspace instead."; # Added 2025-08-30
   moralerspace-hwnf = throw "moralerspace-hwnf has been removed, use moralerspace-hw instead."; # Added 2025-08-30
   morty = throw "morty has been removed, as searxng removed support for it and it was unmaintained."; # Added 2025-09-26
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3fc8c9d034fc..e6a26fe6f280 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11877,10 +11877,6 @@ with pkgs;
     lua = lua5;
   };
 
-  monotoneViz = callPackage ../applications/version-management/monotone-viz {
-    ocamlPackages = ocaml-ng.ocamlPackages_4_14_unsafe_string;
-  };
-
   moolticute = libsForQt5.callPackage ../applications/misc/moolticute { };
 
   mopidyPackages =