diff --git a/.github/sycl-build-deps.env b/.github/sycl-build-deps.env
index 09ee8362a1..fb0ab0ea63 100644
--- a/.github/sycl-build-deps.env
+++ b/.github/sycl-build-deps.env
@@ -1,8 +1,8 @@
 # Open source SYCL build deps, loaded by os-llvm-sycl-build.yml and bumped by
 # bump-sycl-deps.yml from intel/llvm devops/dependencies.json.
 # Kept out of .github/workflows/ since GITHUB_TOKEN can't push workflow files.
-DRIVER_PATH=2026-WW42
-OCLCPUEXP_FN=oclcpuexp-2026.23.10.0.02_160000_rel.tar.gz
-TBB_URL=https://github.com/uxlfoundation/oneTBB/releases/download/v2023.2.0/
-TBB_INSTALL_DIR=oneapi-tbb-2023.2.0
-TBB_FN=oneapi-tbb-2023.2.0-lin.tgz
+DRIVER_PATH=2026-WW28
+OCLCPUEXP_FN=oclcpuexp-2026.22.6.1.17_160000_rel.tar.gz
+TBB_URL=https://github.com/uxlfoundation/oneTBB/releases/download/v2023.1.0/
+TBB_INSTALL_DIR=oneapi-tbb-2023.1.0
+TBB_FN=oneapi-tbb-2023.1.0-lin.tgz
diff --git a/.github/workflows/os-llvm-sycl-build.yml b/.github/workflows/os-llvm-sycl-build.yml
index 0e3bb09444..90c40afb91 100644
--- a/.github/workflows/os-llvm-sycl-build.yml
+++ b/.github/workflows/os-llvm-sycl-build.yml
@@ -128,19 +128,23 @@ jobs:
           fi
 
           # pinned deps are fetched independently of the nightly, so a pin
-          # change replaces whatever the cache restored
+          # change replaces whatever the cache restored; the oclcpuexp
+          # tarball extracts read-only directories, so restore write access
+          # before removing them
           if [ ! -f "${OCLCPUEXP_FN}" ]; then
-              rm -rf oclcpuexp oclcpuexp-*.tar.gz
+              chmod -R u+w oclcpuexp 2>/dev/null
+              rm -rf oclcpuexp oclcpuexp-*.tar.gz || exit 1
               wget "${DOWNLOAD_URL_PREFIX}/${DRIVER_PATH}/${OCLCPUEXP_FN}" || exit 1
           fi
           if [ ! -f "${TBB_FN}" ]; then
-              rm -rf oneapi-tbb-*
+              chmod -R u+w oneapi-tbb-* 2>/dev/null
+              rm -rf oneapi-tbb-* || exit 1
               wget "${TBB_URL}/${TBB_FN}" || exit 1
           fi
           mkdir -p oclcpuexp
-          [ -d oclcpuexp/x64 ] || tar xf "${OCLCPUEXP_FN}" -C oclcpuexp
-          [ -d "${TBB_INSTALL_DIR}/lib" ] || tar xf "${TBB_FN}"
-          cp oclcpuexp/x64/libOpenCL.so* dpcpp_compiler/lib/
+          [ -d oclcpuexp/x64 ] || tar xf "${OCLCPUEXP_FN}" -C oclcpuexp || exit 1
+          [ -d "${TBB_INSTALL_DIR}/lib" ] || tar xf "${TBB_FN}" || exit 1
+          cp -f oclcpuexp/x64/libOpenCL.so* dpcpp_compiler/lib/ || exit 1
 
       - name: Setup Python
         uses: actions/setup-python@6d4fd22b20465ccc0f7354476588e8df7c9ca0e0 # v7.1.0