diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 595befa3..b27d8651 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -76,7 +76,7 @@ stages:
     include:
       - local: '.gitlab/custom-jobs-and-variables.yml'
       - project: 'radiuss/radiuss-shared-ci'
-        ref: 'v2025.09.0'
+        ref: 'v2025.09.1'
         file: 'pipelines/${CI_MACHINE}.yml'
       - artifact: '${CI_MACHINE}-jobs.yml'
         job: 'generate-job-lists'
@@ -89,7 +89,7 @@ include:
     file: 'id_tokens.yml'
   # [Optional] checks preliminary to running the actual CI test
   #- project: 'radiuss/radiuss-shared-ci'
-  #  ref: 'v2025.09.0'
+  #  ref: 'v2025.09.1'
   #  file: 'preliminary-ignore-draft-pr.yml'
   # pipelines subscribed by the project
   - local: '.gitlab/subscribed-pipelines.yml'
diff --git a/.gitlab/custom-jobs-and-variables.yml b/.gitlab/custom-jobs-and-variables.yml
index faf7a2f1..91537b3b 100644
--- a/.gitlab/custom-jobs-and-variables.yml
+++ b/.gitlab/custom-jobs-and-variables.yml
@@ -23,6 +23,17 @@ variables:
 # Project specific deps for dane
   PROJECT_DANE_DEPS: "^raja~examples~exercises "
 
+# Matrix
+# Arguments for top level allocation
+  MATRIX_SHARED_ALLOC: "--exclusive --partition=pci --time=7 --nodes=1"
+# Arguments for job level allocation
+# Note: We repeat the reservation, necessary when jobs are manually re-triggered.
+  MATRIX_JOB_ALLOC: "--partition=pci --overlap --nodes=1"
+# Project specific variants for matrix
+  PROJECT_MATRIX_VARIANTS: "~shared +raja tests=basic +cuda cuda_arch=75"
+# Project specific deps for matrix
+  PROJECT_MATRIX_DEPS: "^raja~examples~exercises "
+
 # Corona
 # Arguments for top level allocation
   CORONA_SHARED_ALLOC: "--exclusive --time-limit=9m --nodes=1"
diff --git a/.gitlab/jobs/matrix.yml b/.gitlab/jobs/matrix.yml
new file mode 100644
index 00000000..05c1c6b2
--- /dev/null
+++ b/.gitlab/jobs/matrix.yml
@@ -0,0 +1,27 @@
+###############################################################################
+# Copyright (c) 2016-25, Lawrence Livermore National Security, LLC and CHAI
+# project contributors. See the CHAI LICENSE file for details.
+#
+# SPDX-License-Identifier: (MIT)
+###############################################################################
+
+# Override reproducer section to define projet specific variables.
+.matrix_reproducer_vars:
+  script:
+    - !reference [.reproducer_vars, script]
+
+########################
+# Overridden shared jobs
+########################
+# We duplicate the shared jobs description and add necessary changes for this
+# project. We keep ${PROJECT_<MACHINE>_VARIANTS} and ${PROJECT_<MACHINE>_DEPS}
+# So that the comparison with the original job is easier.
+
+# No overridden jobs so far.
+
+############
+# Extra jobs
+############
+# We do not recommend using ${PROJECT_<MACHINE>_VARIANTS} and
+# ${PROJECT_<MACHINE>_DEPS} in the extra jobs. There is no reason not to fully
+# describe the spec here.
diff --git a/.gitlab/subscribed-pipelines.yml b/.gitlab/subscribed-pipelines.yml
index 89385060..53203906 100644
--- a/.gitlab/subscribed-pipelines.yml
+++ b/.gitlab/subscribed-pipelines.yml
@@ -38,12 +38,14 @@ generate-job-lists:
     LOCAL_JOBS_PATH: ".gitlab/jobs"
   script:
     - cat ${RADIUSS_JOBS_PATH}/dane.yml ${LOCAL_JOBS_PATH}/dane.yml > dane-jobs.yml
+    - cat ${RADIUSS_JOBS_PATH}/matrix.yml ${LOCAL_JOBS_PATH}/matrix.yml > matrix-jobs.yml
     - cat ${RADIUSS_JOBS_PATH}/corona.yml ${LOCAL_JOBS_PATH}/corona.yml > corona-jobs.yml
     - cat ${RADIUSS_JOBS_PATH}/tioga.yml ${LOCAL_JOBS_PATH}/tioga.yml > tioga-jobs.yml
     - cat ${RADIUSS_JOBS_PATH}/tuolumne.yml ${LOCAL_JOBS_PATH}/tuolumne.yml > tuolumne-jobs.yml
   artifacts:
     paths:
       - dane-jobs.yml
+      - matrix-jobs.yml
       - corona-jobs.yml
       - tioga-jobs.yml
       - tuolumne-jobs.yml
@@ -70,6 +72,28 @@ dane-build-and-test:
       when: never
     - when: on_success
 
+# MATRIX
+matrix-up-check:
+  variables:
+    CI_MACHINE: "matrix"
+  extends: [.machine-check]
+  rules:
+    # Runs except if we explicitly deactivate matrix by variable.
+    - if: '$ON_MATRIX == "OFF"'
+      when: never
+    - when: on_success
+
+matrix-build-and-test:
+  variables:
+    CI_MACHINE: "matrix"
+  needs: [matrix-up-check, generate-job-lists]
+  extends: [.build-and-test]
+  rules:
+    # Runs except if we explicitly deactivate matrix by variable.
+    - if: '$ON_MATRIX == "OFF"'
+      when: never
+    - when: on_success
+
 # CORONA
 corona-up-check:
   variables:
diff --git a/scripts/gitlab/build_and_test.sh b/scripts/gitlab/build_and_test.sh
index 3b4a3fbc..a9720405 100755
--- a/scripts/gitlab/build_and_test.sh
+++ b/scripts/gitlab/build_and_test.sh
@@ -210,7 +210,7 @@ then
     timed_message "Cleaning working directory"
 
     # Map CPU core allocations
-    declare -A core_counts=(["lassen"]=40 ["poodle"]=28 ["dane"]=28 ["corona"]=32 ["rzansel"]=48 ["tioga"]=32 ["tuolumne"]=48)
+    declare -A core_counts=(["lassen"]=40 ["poodle"]=28 ["dane"]=28 ["matrix"]=28 ["corona"]=32 ["rzansel"]=48 ["tioga"]=32 ["tuolumne"]=48)
 
     # If building, then delete everything first
     # NOTE: 'cmake --build . -j core_counts' attempts to reduce individual build resources.
diff --git a/scripts/radiuss-spack-configs b/scripts/radiuss-spack-configs
index a98900c1..c6f855da 160000
--- a/scripts/radiuss-spack-configs
+++ b/scripts/radiuss-spack-configs
@@ -1 +1 @@
-Subproject commit a98900c19c37175b630773c26e7b5467312e89e5
+Subproject commit c6f855daabdd90fe7240d78b31f9964cec584283