diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index d739905..975a9d8 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -27,10 +27,10 @@ jobs:
             system: x86_64-darwin
             runner: macos-26-intel
             flake: bundled
-          - double: x86_64-windows
-            system: x86_64-linux
-            runner: ubuntu-24.04
-            flake: bundled-windows
+          # - double: x86_64-windows
+          #   system: x86_64-linux
+          #   runner: ubuntu-24.04
+          #   flake: bundled-windows
     runs-on: ${{ matrix.target.runner }}
     steps:
       - name: Checkout
diff --git a/3rdParty/GPMC/CMakeLists.txt b/3rdParty/GPMC/CMakeLists.txt
index 35373d4..54f1a72 100755
--- a/3rdParty/GPMC/CMakeLists.txt
+++ b/3rdParty/GPMC/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 
 project(GMPC VERSION 2.0.0 LANGUAGES CXX)
 
diff --git a/flake.lock b/flake.lock
index f21f9b5..b8670cc 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1754292888,
-        "narHash": "sha256-1ziydHSiDuSnaiPzCQh1mRFBsM2d2yRX9I+5OPGEmIE=",
+        "lastModified": 1779971959,
+        "narHash": "sha256-R5nauXyqyfRUFiZycFFZdkF7wl6eaUpPLst35+2nJQY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ce01daebf8489ba97bd1609d185ea276efdeb121",
+        "rev": "ec942ba042dad5ef097e2ef3a3effc034241f011",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-25.05",
+        "ref": "nixos-26.05",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index f04e989..bc0abee 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "Packages and development environments for d4";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
 
   outputs =
     { self, nixpkgs, ... }:
@@ -34,7 +34,7 @@
           paths =
             [
               self.packages.${system}.${windowsSuffix' "mt-kahypar"}
-              pkgs.tbb_2022_0
+              pkgs.tbb_2022
               (boost pkgs)
             ]
             ++ lib.optionals pkgs.stdenv.cc.isGNU [ pkgs.libgcc ]
diff --git a/nix/mt-kahypar.nix b/nix/mt-kahypar.nix
index 711d3c7..4ca7ad6 100644
--- a/nix/mt-kahypar.nix
+++ b/nix/mt-kahypar.nix
@@ -5,7 +5,7 @@
   cmake,
   git,
   boost,
-  tbb_2022_0,
+  tbb_2022,
   windows,
 }:
 let
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     boost.dev
-    tbb_2022_0.dev
+    tbb_2022.dev
   ] ++ lib.optionals stdenv.hostPlatform.isWindows [ windows.pthreads ];
 
   patches = [