diff --git a/pkgs/development/python-modules/dask/default.nix b/pkgs/development/python-modules/dask/default.nix
index af46945b5197..8de30f38a67c 100644
--- a/pkgs/development/python-modules/dask/default.nix
+++ b/pkgs/development/python-modules/dask/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  pythonAtLeast,
 
   # build-system
   setuptools,
@@ -49,6 +50,12 @@ buildPythonPackage rec {
     hash = "sha256-cU4w4dqJQ3ew+fRyD7Lc4URNfW738kKqls6k6j65pIo=";
   };
 
+  # https://github.com/dask/dask/issues/12043
+  postPatch = lib.optionalString (pythonAtLeast "3.14") ''
+    substituteInPlace dask/dataframe/dask_expr/tests/_util.py \
+      --replace-fail "except AttributeError:" "except (AttributeError, pickle.PicklingError):"
+  '';
+
   build-system = [
     setuptools
     setuptools-scm
@@ -112,6 +119,11 @@ buildPythonPackage rec {
     "network"
   ];
 
+  # https://github.com/dask/dask/issues/12042
+  disabledTests = lib.optionals (pythonAtLeast "3.14") [
+    "test_multiple_repartition_partition_size"
+  ];
+
   __darwinAllowLocalNetworking = true;
 
   pythonImportsCheck = [