diff --git a/Snakefile b/Snakefile
index f7479877..a5f21b59 100644
--- a/Snakefile
+++ b/Snakefile
@@ -41,10 +41,7 @@ if config.get("s3_dst"):
 # and the `s3_src` is provided in config since some notify scripts depend
 # do diffs with files on S3 from previous runs
 if send_notifications and config.get("s3_src"):
-    all_targets.extend([
-        f"data/{database}/notify-on-record-change.done",
-        f"data/{database}/notify.done"
-    ])
+    all_targets.append(f"data/{database}/notify.done")
 
 rule all:
     input: all_targets
diff --git a/workflow/snakemake_rules/slack_notifications.smk b/workflow/snakemake_rules/slack_notifications.smk
index b3f50970..5fe52eb6 100644
--- a/workflow/snakemake_rules/slack_notifications.smk
+++ b/workflow/snakemake_rules/slack_notifications.smk
@@ -38,6 +38,7 @@ rule notify_on_record_change:
 
 rule notify_gisaid:
     input:
+        notify_on_record_change = "data/gisaid/notify-on-record-change.done",
         flagged_annotations = rules.transform_gisaid_data.output.flagged_annotations,
         additional_info = "data/gisaid/additional_info.tsv",
         flagged_metadata = "data/gisaid/flagged_metadata.txt"
@@ -52,6 +53,7 @@ rule notify_gisaid:
 
 rule notify_genbank:
     input:
+        notify_on_record_change = "data/genbank/notify-on-record-change.done",
         flagged_annotations = rules.transform_genbank_data.output.flagged_annotations,
         duplicate_biosample = "data/genbank/duplicate_biosample.txt"
     params:
@@ -63,4 +65,3 @@ rule notify_genbank:
         # TODO - which rule produces data/genbank/problem_data.tsv? (was not explicit in `ingest-genbank` bash script)
         shell("./bin/notify-on-problem-data data/genbank/problem_data.tsv")
         shell("./bin/notify-on-duplicate-biosample-change {input.duplicate_biosample} {params.s3_bucket}/duplicate_biosample.txt.gz")
-
diff --git a/workflow/snakemake_rules/upload.smk b/workflow/snakemake_rules/upload.smk
index 7f139037..2002cbf5 100644
--- a/workflow/snakemake_rules/upload.smk
+++ b/workflow/snakemake_rules/upload.smk
@@ -35,7 +35,7 @@ def compute_files_to_upload():
 
                     }
     files_to_upload = files_to_upload | {
-        f"translation_{gene}.fasta.zst" : f"data/{database}/translation_{gene}.fasta" 
+        f"translation_{gene}.fasta.zst" : f"data/{database}/translation_{gene}.fasta"
         for gene in GENE_LIST
     }
 
@@ -52,7 +52,7 @@ def compute_files_to_upload():
 
         files_to_upload["additional_info.tsv.zst"] =     f"data/{database}/additional_info.tsv"
         files_to_upload["flagged_metadata.txt.zst"] =    f"data/{database}/flagged_metadata.txt"
-        
+
     # Include upload of raw NDJSON if we are fetching new sequences from database
     if config.get("fetch_from_database", False):
         files_to_upload.update({
@@ -76,9 +76,15 @@ def compute_files_to_upload():
 
 files_to_upload = compute_files_to_upload()
 
-
 rule upload_single:
-    input: lambda w: files_to_upload[w.remote_filename]
+    input:
+        file_to_upload = lambda w: files_to_upload[w.remote_filename],
+        # Include the notifications touch file as an input to ensure that
+        # uploads only run after the notifications rules have run.
+        # This prevents the race condition between diffs and uploads described
+        # in https://github.com/nextstrain/ncov-ingest/issues/423
+        #   -Jover, 2024-01-26
+        notifications_flag = f"data/{database}/notify.done" if send_notifications else [],
     output:
         "data/{database}/{remote_filename}.upload",
     params:
@@ -89,7 +95,7 @@ rule upload_single:
         """
         ./vendored/upload-to-s3 \
             {params.quiet} \
-            {input:q} \
+            {input.file_to_upload:q} \
             {params.s3_bucket:q}/{wildcards.remote_filename:q} \
             {params.cloudfront_domain} 2>&1 | tee {output}
         """
@@ -98,7 +104,7 @@ rule remove_rerun_touchfile:
     """
     Remove the rerun touchfile if such a file is present
     """
-    input: 
+    input:
         f"data/{database}/{{remote_filename}}.upload",
     output:
         f"data/{database}/{{remote_filename}}.renew.deleted",
@@ -115,7 +121,7 @@ rule upload:
     Requests one touch file for each uploaded remote file
     Dynamically determines that list of files
     """
-    input: 
+    input:
         uploads = [f"data/{database}/{remote_file}.upload" for remote_file in files_to_upload.keys()],
         touchfile_removes=[
             f"data/{database}/{remote_file}.renew.deleted" for remote_file in [