diff --git a/sycl/cmake/modules/FetchUnifiedRuntime.cmake b/sycl/cmake/modules/FetchUnifiedRuntime.cmake
index c3afe1fa0fb91..c677b0cdb9213 100644
--- a/sycl/cmake/modules/FetchUnifiedRuntime.cmake
+++ b/sycl/cmake/modules/FetchUnifiedRuntime.cmake
@@ -116,14 +116,25 @@ if(SYCL_UR_USE_FETCH_CONTENT)
       CACHE PATH "Path to external '${name}' adapter source dir" FORCE)
   endfunction()
 
-  set(UNIFIED_RUNTIME_REPO "https://github.com/oneapi-src/unified-runtime.git")
-  # commit 26f1dfc0b187763bc739537bdd0d8c76f32bd48e
-  # Merge: 89dc3a56 2dbe0800
-  # Author: Omar Ahmed <omar.ahmed@codeplay.com>
-  # Date:   Tue Aug 13 11:12:55 2024 +0100
-  #     Merge pull request #1960 from Bensuo/ewan/imm_command_list_fix
-  #     Command-buffer immediate command-list CTS fix
-  set(UNIFIED_RUNTIME_TAG 26f1dfc0b187763bc739537bdd0d8c76f32bd48e)
+  set(UNIFIED_RUNTIME_REPO "https://github.com/RossBrunton/unified-runtime.git")
+  # commit put-git-commit-hash-here
+  # Author: Ross Brunton <ross@codeplay.com>
+  # Date:   Fri Mar 22 17:18:22 2024 +0000
+  #
+  #     [Spec Constants] Improved handling of invalid/unsupported spec. constants
+  #
+  #     Two main changes to how `Kernel/ProgramSetSpecializationConstants`
+  #     are handled:
+  #     * They may now output either `INVALID_VALUE` or the new
+  #       `INVALID_SPEC_ID` when the provided list is invalid.
+  #     * The OpenCL and level 0 adapters now respond to
+  #       `UR_DEVICE_INFO_KERNEL_SET_SPECIALIZATION_CONSTANTS` with `false`
+  #       rather than erroring out. This fixes some tests that were
+  #       incorrectly not being skipped.
+  #     * `urKernelSetSpecializationConstants` now "implemented" (as a
+  #       function that returns `UNSUPPORTED_FEATURE` for a number of
+  #       adapters.
+  set(UNIFIED_RUNTIME_TAG 429267f21dd6acb08ac77505c33a6235e68bac31)
 
   set(UMF_BUILD_EXAMPLES OFF CACHE INTERNAL "EXAMPLES")
   # Due to the use of dependentloadflag and no installer for UMF and hwloc we need