diff --git a/pkgs/by-name/sl/slurm/package.nix b/pkgs/by-name/sl/slurm/package.nix
index 047c39b11bfc..9c775ad623fd 100644
--- a/pkgs/by-name/sl/slurm/package.nix
+++ b/pkgs/by-name/sl/slurm/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   runCommand,
   config,
   pkg-config,
@@ -41,7 +42,7 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "slurm";
-  version = "25.05.3.1";
+  version = "25.11.1.1";
 
   # N.B. We use github release tags instead of https://www.schedmd.com/downloads.php
   # because the latter does not keep older releases.
@@ -50,7 +51,7 @@ stdenv.mkDerivation (finalAttrs: {
     repo = "slurm";
     # The release tags use - instead of .
     rev = "slurm-${builtins.replaceStrings [ "." ] [ "-" ] finalAttrs.version}";
-    hash = "sha256-W/q9eN4Ov3pxp2qyr3b7G4ayDaNtFUPQeAcOHCB23Q8=";
+    hash = "sha256-Hv0rqogwZH5GafwlELghAbKLwurd8x30u9DJZylBQP0=";
   };
 
   outputs = [
@@ -58,6 +59,15 @@ stdenv.mkDerivation (finalAttrs: {
     "dev"
   ];
 
+  patches = [
+    # upstream patch; remove with next upgrade.
+    (fetchpatch {
+      name = "pmix-509-compatability.patch";
+      url = "https://github.com/SchedMD/slurm/commit/be063f0c646d2bfe10d358fa7063f2b64e19e063.patch";
+      hash = "sha256-QbKMBMl+VTLrzdXhPtcqwC7OcAXcJBxDS8jRZ2EoJL4=";
+    })
+  ];
+
   prePatch = ''
     substituteInPlace src/common/env.c \
         --replace "/bin/echo" "${lib.getExe' coreutils "echo"}"