diff --git a/.guix/modules/ogs-package.scm b/.guix/modules/ogs-package.scm
index 1562bc3e3d926ede42d0eb162d0ff70314d7fb5c..62e5bf93c48f72ff9bfda6e88ac073956d788d1d 100644
--- a/.guix/modules/ogs-package.scm
+++ b/.guix/modules/ogs-package.scm
@@ -175,9 +175,9 @@
     (arguments
      (substitute-keyword-arguments (package-arguments vtk)
        ((#:configure-flags flags)
-        `(cons* "-DVTK_MODULE_ENABLE_VTK_IOParallelXML=YES"
-                "-DVTK_MODULE_ENABLE_VTK_ParallelMPI=YES" "-DVTK_USE_MPI=ON"
-                ,flags))))
+        #~(append '("-DVTK_MODULE_ENABLE_VTK_IOParallelXML=YES"
+                "-DVTK_MODULE_ENABLE_VTK_ParallelMPI=YES" "-DVTK_USE_MPI=ON")
+                #$flags))))
     (synopsis "VTK with OpenMPI support")))
 
 (define pybind11-2.10.4
diff --git a/scripts/ci/jobs/build-guix.yml b/scripts/ci/jobs/build-guix.yml
index d34b92e718a7ff0399b78928829adc20a4f38384..2b8ab999980e5eaa02c2cdfe1b12f045922a7d93 100644
--- a/scripts/ci/jobs/build-guix.yml
+++ b/scripts/ci/jobs/build-guix.yml
@@ -1,6 +1,6 @@
 variables:
-  GUIX_PETSC_CONTAINER: /data/ogs/apptainer/guix/ogs-petsc-ssd_head.squashfs
-  GUIX_COMMIT: v1.4.0
+  GUIX_PETSC_CONTAINER: /data/ogs/apptainer/guix/ogs-petsc_head.squashfs
+  GUIX_COMMIT: 8d70ff3a49f7cdf0eab93b3a1c54ec2f016afc4a
 
 build guix:
   stage: build
@@ -8,16 +8,17 @@ build guix:
   needs: []
   variables:
     GIT_SUBMODULE_STRATEGY: recursive
-    GUIX_COMMIT: v1.4.0
   rules:
     - if: '$CI_COMMIT_BRANCH == "master"'
       allow_failure: true
     - when: manual
       allow_failure: true
   script:
+    - which guix
+    - guix describe
     # SteadyStateDiffusion only!
-    - guix time-machine --commit=${GUIX_COMMIT} -- build --fallback -L $PWD/.guix/modules ogs-ssd
-    - guix time-machine --commit=${GUIX_COMMIT} -- build --fallback -L $PWD/.guix/modules ogs-petsc-ssd
+    - guix build --fallback -L $PWD/.guix/modules ogs-ssd
+    - guix build --fallback -L $PWD/.guix/modules ogs-petsc-ssd
 
 deploy guix container eve:
   stage: build
@@ -29,8 +30,10 @@ deploy guix container eve:
     - if: '$CI_COMMIT_BRANCH == "master"'
       allow_failure: true
   script:
+    - which guix
+    - guix describe
     # All processes.
-    - image=$( guix time-machine --commit=${GUIX_COMMIT} -- pack --fallback -L $PWD/.guix/modules -S /bin=bin -RR --format=squashfs bash ogs-petsc | tee | tail -1 )
+    - image=$( guix pack --no-substitutes -L $PWD/.guix/modules -RR --format=squashfs bash ogs-petsc | tee | tail -1 )
     - echo "Image $image"
     - ssh sonjenk@frontend2.eve.ufz.de rm -f ${GUIX_PETSC_CONTAINER}
     - scp $image sonjenk@frontend2.eve.ufz.de:${GUIX_PETSC_CONTAINER}
@@ -47,7 +50,7 @@ test guix container eve:
     - mkdir -p $work_dir
     - cp -r ${CI_PROJECT_DIR}/Tests/Data/EllipticPETSc $work_dir/
     - export prj_file=${work_dir}/EllipticPETSc/cube_1e3_XDMF_np3.prj
-    - jid=$(sbatch --chdir=${work_dir} --job-name=test-guix-container --mem-per-cpu=1G --ntasks=3 --output=/work/%u/%x_%j.out --parsable --time=1 --partition=rocky-9 --wrap="srun apptainer exec ${GUIX_PETSC_CONTAINER} ogs ${prj_file}")
+    - jid=$(sbatch --chdir=${work_dir} --job-name=test-guix-container --mem-per-cpu=1G --ntasks=3 --output=/work/%u/%x_%j.out --parsable --time=5 --partition=rocky-9 --wrap="srun apptainer exec ${GUIX_PETSC_CONTAINER} ogs ${prj_file}")
     # - touch /work/$USER/ci_log_$jid.out # required on frontend1, tail -F does not recognize file created
     - while true; do grep "$jid" < <(squeue -hj "$jid") || break; sleep 10; done &> /dev/null & tail -F /work/$USER/test-guix-container_$jid.out --pid="$!" || true
     - exit_code=$(sacct -j $jid.0 --format=ExitCode --noheader | cut -d':' -f1)
diff --git a/web/content/docs/userguide/features/parallel_computing_mpi.md b/web/content/docs/userguide/features/parallel_computing_mpi.md
index 3ca945ddb11856511a8bd47b9aee8999aa979b85..5a55b08ba08cec4a2ad2022b866be5844fb0b465 100644
--- a/web/content/docs/userguide/features/parallel_computing_mpi.md
+++ b/web/content/docs/userguide/features/parallel_computing_mpi.md
@@ -192,7 +192,7 @@ For the detailed syntax of job script of SLURM for EVE, please visit <https://wi
 
 A prebuilt container with `ogs` (current master) is available at:
 
-* `/data/ogs/apptainer/guix/ogs-petsc-ssd_head.squashfs`
+* `/data/ogs/apptainer/guix/ogs-petsc_head.squashfs`
 
 You need to modify your submit script, e.g.:
 
@@ -200,7 +200,7 @@ You need to modify your submit script, e.g.:
 ...
 #SBATCH ...
 
-srun apptainer exec /data/ogs/apptainer/guix/ogs-petsc-ssd_head.squashfs ogs $PRJ_FILE
+srun apptainer exec /data/ogs/apptainer/guix/ogs-petsc_head.squashfs ogs $PRJ_FILE
 ```
 
 ### 3. Check results