diff --git a/pkgs/development/python-modules/dask/default.nix b/pkgs/development/python-modules/dask/default.nix
index f10b8b100be4..7053d02a0dc6 100644
--- a/pkgs/development/python-modules/dask/default.nix
+++ b/pkgs/development/python-modules/dask/default.nix
@@ -3,6 +3,7 @@
   stdenv,
   buildPythonPackage,
   fetchFromGitHub,
+  fetchpatch,
   pythonAtLeast,
   util-linux,
 
@@ -54,6 +55,14 @@ buildPythonPackage (finalAttrs: {
     hash = "sha256-JfCiABGSCJKKSz2/r8fvpVwdQSZqvoQICe+lDvuNhoM=";
   };
 
+  patches = [
+    # Unit-less timedelta64 is deprecated in NumPy 2.5
+    (fetchpatch {
+      url = "https://github.com/dask/dask/commit/ade7a30c5a222f838b0f69f5a00c804e4cdf3d19.patch";
+      hash = "sha256-V2jNcTfmEXjUzsXKnK2+/AWaujXN+c7JCCGojzwY5dM=";
+    })
+  ];
+
   postPatch = lib.optionalString stdenv.hostPlatform.isLinux ''
     substituteInPlace dask/tests/test_system.py \
       --replace-fail \