diff --git a/scripts/sell_unused_slots.py b/scripts/sell_unused_slots.py
index 5cd68f2849..e583ed398f 100644
--- a/scripts/sell_unused_slots.py
+++ b/scripts/sell_unused_slots.py
@@ -76,6 +76,8 @@ def _list_contribution_lambda_functions(cls) -> list[Lambda]:
         ]
 
     def _lambda_invocation_counts(self) -> dict[Lambda, int]:
+        # FIXME: DeprecationWarning for datetime methods in Python 3.12
+        #        https://github.com/DataBiosphere/azul/issues/5953
         end = datetime.utcnow()
         start = end - timedelta(minutes=self.interval)
         lambdas_by_name = {
diff --git a/src/azul/dss.py b/src/azul/dss.py
index 08b67f3fde..bf1ca6baf5 100644
--- a/src/azul/dss.py
+++ b/src/azul/dss.py
@@ -9,6 +9,8 @@
 
 
 def new_version():
+    # FIXME: DeprecationWarning for datetime methods in Python 3.12
+    #        https://github.com/DataBiosphere/azul/issues/5953
     return datetime.utcnow().strftime(version_format)
 
 
diff --git a/test/azul_test_case.py b/test/azul_test_case.py
index c6d9ecff49..1173e44f63 100644
--- a/test/azul_test_case.py
+++ b/test/azul_test_case.py
@@ -144,6 +144,11 @@ class RE(str):
                     'The \'body\' parameter is deprecated for the \'.*\' API '
                     'and will be removed in .*. Instead use .*'
                 ),
+
+                # FIXME: DeprecationWarning for datetime methods in Python 3.12
+                #        https://github.com/DataBiosphere/azul/issues/5953
+                'datetime.datetime.utcnow() is deprecated',
+                'datetime.datetime.utcfromtimestamp() is deprecated'
             },
             UserWarning: {
                 'https://github.com/DataBiosphere/azul/issues/2114',
diff --git a/test/service/test_manifest.py b/test/service/test_manifest.py
index 0af86f41c0..407cc751e6 100644
--- a/test/service/test_manifest.py
+++ b/test/service/test_manifest.py
@@ -1066,6 +1066,8 @@ def test_bdbag_manifest_remove_redundant_entries(self):
         Test BDBagManifestGenerator._remove_redundant_entries() directly with a
         large set of sample data
         """
+        # FIXME: DeprecationWarning for datetime methods in Python 3.12
+        #        https://github.com/DataBiosphere/azul/issues/5953
         now = datetime.utcnow()
 
         def v(i):