diff --git a/pyproject.toml b/pyproject.toml
index dc96004..8ad05af 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -75,9 +75,7 @@ ignore = [
     "ANN401", # Dynamically typed expressions (typing.Any) are disallowed
     "ANN204", # Missing type annotation for special method `__init__`
     "COM812", # Trailing comma prohibited
-    "E731", # Do not assign a lambda expression, use a def
     "G004", # Logging statement uses f-string
-    "PLW0603", # Using the global statement to update `<VAR>` is discouraged
     "Q000", # Single quotes found but double quotes preferred
     "Q003", # Single quotes found but double quotes preferred
     "PLR0912", # Too many branches (> 12)
@@ -104,8 +102,8 @@ commit_args = ""
 
 [[tool.bumpversion.files]]
 filename = "pyproject.toml"
-search = "version='{current_version}'"
-replace = "version='{new_version}'"
+search = 'version="{current_version}"'
+replace = 'version="{new_version}"'
 
 [[tool.bumpversion.files]]
 filename = "Dockerfile"
diff --git a/src/cpg_flow_mito/jobs/annotations_update.py b/src/cpg_flow_mito/jobs/annotations_update.py
new file mode 100644
index 0000000..8f85260
--- /dev/null
+++ b/src/cpg_flow_mito/jobs/annotations_update.py
@@ -0,0 +1,22 @@
+from cpg_utils import Path, config, hail_batch
+
+
+def download_latest_annotations(output_path: Path, job_attrs: dict[str, str]):
+    """Trigger the MitoMap download, save to GCP."""
+
+    batch_instance = hail_batch.get_batch()
+    job = batch_instance.new_bash_job('Monthly annotation update', job_attrs | {'tool': 'mitoreport'})
+    job.image(config.config_retrieve(['images', 'mitoreport']))
+
+    # noted that this succeeds locally, but may be fragile. Perhaps a retry wrap makes sense.
+    job.command(f"""
+    n=0
+    until [ "$n" -ge 5 ]
+    do
+       java -jar mitoreport.jar mito-map-download --output {job.output} && break
+       n=$((n+1))
+       sleep 20
+    done
+    """)
+    batch_instance.write_output(job.output, output_path)
+    return job
diff --git a/src/cpg_flow_mito/jobs/mito.py b/src/cpg_flow_mito/jobs/mito.py
index 1f6f9a4..20529bc 100644
--- a/src/cpg_flow_mito/jobs/mito.py
+++ b/src/cpg_flow_mito/jobs/mito.py
@@ -703,6 +703,7 @@ def mitoreport(
     vcf_path: Path,
     cram_path: Path,
     output_path: Path,
+    annotations: Path,
     job_attrs: dict,
 ) -> Job:
     """
@@ -716,6 +717,7 @@ def mitoreport(
     res = resources.STANDARD.request_resources(ncpu=2)
     res.set_to_job(j)
 
+    localised_annotations = batch_instance.read_input(annotations)
     vcf = batch_instance.read_input_group(**{'vcf.gz': str(vcf_path)})
     cram = batch_instance.read_input_group(
         **{
@@ -732,7 +734,7 @@ def mitoreport(
 
         java -jar mitoreport.jar mito-report \
             -sample {sequencing_group.id} \
-            -mann resources/mito_map_annotations.json \
+            -mann {localised_annotations} \
             -gnomad resources/gnomad.genomes.v3.1.sites.chrM.vcf.bgz \
             -vcf {vcf['vcf.gz']} \
             {sequencing_group.id}.bam ./resources/controls/*.bam
diff --git a/src/cpg_flow_mito/stages.py b/src/cpg_flow_mito/stages.py
index 8ea7f68..3c1fcb2 100644
--- a/src/cpg_flow_mito/stages.py
+++ b/src/cpg_flow_mito/stages.py
@@ -5,10 +5,45 @@
 https://github.com/broadinstitute/gatk/blob/master/scripts/mitochondria_m2_wdl/MitochondriaPipeline.wdl
 """
 
+import zoneinfo
+from datetime import datetime
+from functools import cache
+
 from cpg_flow import stage, targets, workflow
-from cpg_utils import Path, config, hail_batch
+from cpg_flow.stage import StageInput, StageOutput
+from cpg_flow.targets import MultiCohort
+from cpg_utils import Path, config, hail_batch, to_path
+
+from cpg_flow_mito.jobs import annotations_update, bcftools, mito, picard, vep
+
 
-from cpg_flow_mito.jobs import bcftools, mito, picard, vep
+@cache
+def get_path_to_mito_ref_data():
+    """Build a path to the expected MitoMap annotations."""
+    tz = zoneinfo.ZoneInfo('Australia/Brisbane')
+    this_month_as_string = datetime.now(tz=tz).strftime('%Y-%m')
+    common_default = config.config_retrieve(['storage', 'common', 'default'])
+    return to_path(common_default) / 'mitoreport_ref' / this_month_as_string / 'mito_map_annotations.json'
+
+
+@stage.stage
+class DownloadMitoMapData(stage.MultiCohortStage):
+    """A once-monthly download of the data required in Mitomap."""
+
+    def expected_outputs(self, _multicohort: MultiCohort) -> dict[str, Path]:
+        return {'annotations': get_path_to_mito_ref_data()}
+
+    def queue_jobs(
+        self,
+        multicohort: MultiCohort,
+        _inputs: StageInput,
+    ) -> StageOutput:
+        output = self.expected_outputs(multicohort)
+        job = annotations_update.download_latest_annotations(
+            output['annotations'],
+            job_attrs=self.get_job_attrs(multicohort),
+        )
+        return self.make_outputs(multicohort, output, jobs=job)
 
 
 @stage.stage(
@@ -339,7 +374,7 @@ def queue_jobs(
 
 
 @stage.stage(
-    required_stages=[RealignMito, GenotypeMito],
+    required_stages=[DownloadMitoMapData, RealignMito, GenotypeMito],
     analysis_type='web',
     analysis_keys=['mitoreport'],
 )
@@ -370,6 +405,9 @@ def queue_jobs(
     ) -> stage.StageOutput:
         outputs = self.expected_outputs(sequencing_group)
 
+        multicohort = workflow.get_multicohort()
+        mitomap_annotations = inputs.as_path(multicohort, DownloadMitoMapData, 'annotations')
+
         jobs = []
 
         vep_j = vep.vep_one(
@@ -385,6 +423,7 @@ def queue_jobs(
             vcf_path=outputs['vep_vcf'],
             cram_path=inputs.as_path(sequencing_group, RealignMito, 'non_shifted_cram'),
             output_path=outputs['mitoreport'],
+            annotations=mitomap_annotations,
             job_attrs=self.get_job_attrs(sequencing_group),
         )
         if mitoreport_j: