diff --git a/.github/workflows/mulled.yaml b/.github/workflows/mulled.yaml
index 4d33cc3febd7..6d36a454d807 100644
--- a/.github/workflows/mulled.yaml
+++ b/.github/workflows/mulled.yaml
@@ -44,6 +44,8 @@ jobs:
           key: tox-cache-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('galaxy root/requirements.txt') }}-mulled
       - name: Install Apptainer's singularity
         uses: eWaterCycle/setup-apptainer@v2
+        with:
+          apptainer-version: 1.3.6  # https://github.com/eWaterCycle/setup-apptainer/pull/68
       - name: Install tox
         run: pip install tox
       - name: Run tests
diff --git a/pytest.ini b/pytest.ini
index 7c1d40306310..e2e406ef82ba 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,5 +1,5 @@
 [pytest]
-addopts = --doctest-continue-on-failure --verbosity=1
+addopts = --doctest-continue-on-failure --verbosity=1 --showlocals
 asyncio_mode = auto
 log_level = DEBUG
 # Install pytest-memray and set memray to true here to enable memory profiling of tests
diff --git a/test/unit/tool_util/mulled/test_mulled_update_singularity_containers.py b/test/unit/tool_util/mulled/test_mulled_update_singularity_containers.py
index 728757b52f31..9ec4e47b44f8 100644
--- a/test/unit/tool_util/mulled/test_mulled_update_singularity_containers.py
+++ b/test/unit/tool_util/mulled/test_mulled_update_singularity_containers.py
@@ -46,6 +46,6 @@ def test_singularity_container_test(tmp_path) -> None:
         "singularity",
         tmp_path,
     )
-    assert "samtools:1.0--1" in results["passed"]
-    assert "pybigwig:0.3.22--py36h54a71a5_0" in results["passed"]
-    assert "yasm:1.3.0--0" in results["notest"]
+    assert "samtools:1.0--1" in results["passed"], results
+    assert "pybigwig:0.3.22--py36h54a71a5_0" in results["passed"], results
+    assert "yasm:1.3.0--0" in results["notest"], results