diff --git a/.github/workflows/documentation.yaml b/.github/workflows/documentation.yaml
index bf4a5c2..f945b23 100644
--- a/.github/workflows/documentation.yaml
+++ b/.github/workflows/documentation.yaml
@@ -11,16 +11,16 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.1.1
+      - uses: actions/checkout@v5.0.0
       - name: Configure Git Credentials
         run: |
           git config user.name github-actions[bot]
           git config user.email 41898282+github-actions[bot]@users.noreply.github.com
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6.0.0
         with:
           python-version: 3.11
       - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4.3.0
         with:
           key: mkdocs-material-${{ env.cache_id }}
           path: .cache
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 0ef00e2..5a2576d 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -23,17 +23,17 @@ jobs:
 
     steps:
       - name: Checkout BrahMap repository
-        uses: actions/checkout@v4.2.2
+        uses: actions/checkout@v5.0.0
         with:
           submodules: true
 
       - name: Install MPI - ${{ matrix.mpi }}
-        uses: mpi4py/setup-mpi@v1.3.1
+        uses: mpi4py/setup-mpi@v1.3.5
         with:
           mpi: ${{ matrix.mpi }}
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5.5.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/brahmap/lbsim/lbsim_GLS.py b/brahmap/lbsim/lbsim_GLS.py
index 449da80..b2c2559 100644
--- a/brahmap/lbsim/lbsim_GLS.py
+++ b/brahmap/lbsim/lbsim_GLS.py
@@ -140,14 +140,14 @@ def LBSim_compute_GLS_maps(
 
     if len(components) > 1:
         lbs.mapmaking.destriper._sum_components_into_obs(
-            obs_list=observations,
+            obs_list=processed_samples.obs_list,
             target=components[0],
             other_components=components[1:],
             factor=1.0,
         )
 
     time_ordered_data = np.concatenate(
-        [getattr(obs, components[0]) for obs in observations], axis=None
+        [getattr(obs, components[0]) for obs in processed_samples.obs_list], axis=None
     )
 
     gls_result = compute_GLS_maps_from_PTS(
diff --git a/tests/test_LBSim_GLS.py b/tests/test_LBSim_GLS.py
index eafd9ac..ca62a98 100644
--- a/tests/test_LBSim_GLS.py
+++ b/tests/test_LBSim_GLS.py
@@ -95,16 +95,19 @@ def __init__(self, nside, dtype_float):
         if comm_size == 2:
             n_block_det = 2
             n_block_time = 1
+            num_of_obs_per_detector = 1
         elif comm_size == 4:
             n_block_det = 2
             n_block_time = 2
+            num_of_obs_per_detector = 3
         else:
             n_block_det = 1
             n_block_time = self.comm.Get_size()
+            num_of_obs_per_detector = 2
 
         self.sim.create_observations(
             detectors=dets,
-            num_of_obs_per_detector=3,
+            num_of_obs_per_detector=num_of_obs_per_detector,
             n_blocks_det=n_block_det,
             n_blocks_time=n_block_time,
             split_list_over_processes=False,
diff --git a/tests/test_LBSim_noise_ops.py b/tests/test_LBSim_noise_ops.py
index c65af88..25dac4c 100644
--- a/tests/test_LBSim_noise_ops.py
+++ b/tests/test_LBSim_noise_ops.py
@@ -25,6 +25,7 @@ class lbsim_simulation:
     def __init__(self):
         self.comm = lbs.MPI_COMM_WORLD
         tmp_dir = tempfile.TemporaryDirectory()
+        imo = lbs.Imo(flatfile_location=lbs.PTEP_IMO_LOCATION)
 
         self.sim = lbs.Simulation(
             base_path=tmp_dir.name,
@@ -32,6 +33,7 @@ def __init__(self):
             duration_s=71,  # Do not increase this number
             random_seed=65454,
             mpi_comm=self.comm,
+            imo=imo,
         )
 
         self.detector_list = [