diff --git a/pkgs/by-name/pd/pdfding/frontend.nix b/pkgs/by-name/pd/pdfding/frontend.nix
index 76090903d5e0..f8ee7827db89 100644
--- a/pkgs/by-name/pd/pdfding/frontend.nix
+++ b/pkgs/by-name/pd/pdfding/frontend.nix
@@ -8,8 +8,8 @@
   pdfding,
 }:
 let
-  pdfjsVersion = "5.5.207"; # see update script
-  pdfjsHash = "sha256-HikisEa6L+BqsG6imgWhV+4J46BluU5zqU1nFZAG0eM=";
+  pdfjsVersion = "6.1.200"; # see update script
+  pdfjsHash = "sha256-8hByPf4BXTXakRxomXtknthlCLcjG/pCLVnjMxqrROI=";
   pdfjs = fetchzip {
     url = "https://github.com/mozilla/pdf.js/releases/download/v${pdfjsVersion}/pdfjs-${pdfjsVersion}-dist.zip";
     hash = pdfjsHash;
@@ -31,7 +31,7 @@ stdenv.mkDerivation (finalAttrs: {
   npmDeps = fetchNpmDeps {
     inherit (finalAttrs) src;
     name = "pdfding-${finalAttrs.version}-npm-deps";
-    hash = "sha256-TDX2xoHj07aUeuLPt/TlgkdRdTiv3fNbriChzEB4EXk=";
+    hash = "sha256-4mnw9sLQBZCBqmTKkjNHx03pgmvQ4CuDg3NOke4vMHs=";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/by-name/pd/pdfding/package.nix b/pkgs/by-name/pd/pdfding/package.nix
index 14be17f12abe..c31c6ef1d0ec 100644
--- a/pkgs/by-name/pd/pdfding/package.nix
+++ b/pkgs/by-name/pd/pdfding/package.nix
@@ -12,19 +12,20 @@ let
 in
 python.pkgs.buildPythonPackage (finalAttrs: {
   pname = "pdfding";
-  version = "1.10.0";
+  version = "1.12.0";
   src = fetchFromGitHub {
     owner = "mrmn2";
     repo = "PdfDing";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-C1osj8V9+z3ahl4+zUtyI22GMtSgNLzfdGttL7gPDvY=";
+    hash = "sha256-LcZa9BxP99lI7Hqt3seyBeFNn4oLtR31yjq3Ap/IwUE=";
   };
   pyproject = true;
 
   strictDeps = true;
   __structuredAttrs = true;
 
-  # remove supervisor from dependencies and fix version
+  # remove supervisor from dependencies, we use systemd
+  # and fix version, TODO move to pyprojectVersionPatchHook when it is available in stable 26.05
   postPatch = ''
     sed -i 's/supervisor.*$//' pyproject.toml
     sed -i 's/^version = .*$/version = "${finalAttrs.version}"/' pyproject.toml
@@ -132,6 +133,7 @@ python.pkgs.buildPythonPackage (finalAttrs: {
       "''${makeWrapperArgs[@]}"
   '';
 
+  # NOTE: don't undo relaxing of any of these, they are bound to break again
   pythonRelaxDeps = [
     "django"
     "django-allauth"