diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f3eab0e9..33f9304a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -2,6 +2,7 @@ name: Tests
 
 on:
   - push
+  - pull_request
 
 jobs:
   pytest:
diff --git a/sacred/config/custom_containers.py b/sacred/config/custom_containers.py
index 746e8e96..352a16f2 100644
--- a/sacred/config/custom_containers.py
+++ b/sacred/config/custom_containers.py
@@ -300,6 +300,19 @@ def type_changed(old_value, new_value):
 def is_different(old_value, new_value):
     """Numpy aware comparison between two values."""
     if opt.has_numpy:
-        return not opt.np.array_equal(old_value, new_value)
-    else:
-        return old_value != new_value
+        # Reproduces np.array_equal from numpy<2
+        # np.array_equal raises an exception when the arguments are scalar and
+        # differ in type (e.g. int and str) in numpy>=2.0
+        try:
+            old_value = opt.np.asarray(old_value)
+            new_value = opt.np.asarray(new_value)
+        except:
+            return False
+        else:
+            result = old_value == new_value
+            if isinstance(result, bool):
+                return result
+            else:
+                return result.all()
+
+    return old_value != new_value
diff --git a/tests/test_config/test_utils.py b/tests/test_config/test_utils.py
index 70a68e37..b882b39c 100644
--- a/tests/test_config/test_utils.py
+++ b/tests/test_config/test_utils.py
@@ -22,7 +22,6 @@
         "uint16",
         "uint32",
         "uint64",
-        "float_",
         "float16",
         "float32",
         "float64",
@@ -49,7 +48,6 @@ def test_normalize_or_die_for_numpy_datatypes(typename):
         "uint16",
         "uint32",
         "uint64",
-        "float_",
         "float16",
         "float32",
         "float64",
diff --git a/tests/test_observers/test_s3_observer.py b/tests/test_observers/test_s3_observer.py
index c4e2111d..a9000cef 100644
--- a/tests/test_observers/test_s3_observer.py
+++ b/tests/test_observers/test_s3_observer.py
@@ -77,7 +77,7 @@ def _get_file_data(bucket_name, key):
     return s3.Object(bucket_name, key).get()["Body"].read()
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_fs_observer_started_event_creates_bucket(observer, sample_run):
     _id = observer.started_event(**sample_run)
     run_dir = s3_join(BASEDIR, str(_id))
@@ -102,7 +102,7 @@ def test_fs_observer_started_event_creates_bucket(observer, sample_run):
     }
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_fs_observer_started_event_increments_run_id(observer, sample_run):
     _id = observer.started_event(**sample_run)
     _id2 = observer.started_event(**sample_run)
@@ -119,7 +119,7 @@ def test_s3_observer_equality():
     assert obs_one != different_bucket
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_raises_error_on_duplicate_id_directory(observer, sample_run):
     observer.started_event(**sample_run)
     sample_run["_id"] = 1
@@ -127,7 +127,7 @@ def test_raises_error_on_duplicate_id_directory(observer, sample_run):
         observer.started_event(**sample_run)
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_completed_event_updates_run_json(observer, sample_run):
     observer.started_event(**sample_run)
     run = json.loads(
@@ -145,7 +145,7 @@ def test_completed_event_updates_run_json(observer, sample_run):
     assert run["status"] == "COMPLETED"
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_interrupted_event_updates_run_json(observer, sample_run):
     observer.started_event(**sample_run)
     run = json.loads(
@@ -163,7 +163,7 @@ def test_interrupted_event_updates_run_json(observer, sample_run):
     assert run["status"] == "SERVER_EXPLODED"
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_failed_event_updates_run_json(observer, sample_run):
     observer.started_event(**sample_run)
     run = json.loads(
@@ -181,7 +181,7 @@ def test_failed_event_updates_run_json(observer, sample_run):
     assert run["status"] == "FAILED"
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_queued_event_updates_run_json(observer, sample_run):
     del sample_run["start_time"]
     sample_run["queue_time"] = T2
@@ -194,7 +194,7 @@ def test_queued_event_updates_run_json(observer, sample_run):
     assert run["status"] == "QUEUED"
 
 
-@moto.mock_s3
+@moto.mock_aws
 def test_artifact_event_works(observer, sample_run, tmpfile):
     observer.started_event(**sample_run)
     observer.artifact_event("test_artifact.py", tmpfile.name)
diff --git a/tox.ini b/tox.ini
index b3ffd106..f90bf62e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py{38,39,310,311}, setup, numpy-{120,121,123}, tensorflow-{26,27,28,29,210,211}
+envlist = py{38,39,310,311}, setup, numpy-{120,121,123,200}, tensorflow-{212,216}
 
 [testenv]
 deps =
@@ -53,68 +53,34 @@ deps =
 commands =
     pytest tests/test_config {posargs}
 
-[testenv:tensorflow-115]
+[testenv:numpy-200]
 basepython = python
 deps =
     -rdev-requirements.txt
-    tensorflow~=1.15.0
+    numpy~=2.0.0
 commands =
-    pytest tests/test_stflow tests/test_optional.py \
-        {posargs}
-
-[testenv:tensorflow-26]
-basepython = python
-deps =
-    -rdev-requirements.txt
-    tensorflow~=2.6.0
-commands =
-    pytest tests/test_stflow tests/test_optional.py \
-        {posargs}
-
-[testenv:tensorflow-27]
-basepython = python
-deps =
-    -rdev-requirements.txt
-    tensorflow~=2.7.0
-commands =
-    pytest tests/test_stflow tests/test_optional.py \
-        {posargs}
+    pytest tests/test_config {posargs}
 
-[testenv:tensorflow-28]
+[testenv:tensorflow-212]
 basepython = python
 deps =
     -rdev-requirements.txt
-    tensorflow~=2.8.0
+    numpy<2.0.0
+    tensorflow~=2.12.0
 commands =
     pytest tests/test_stflow tests/test_optional.py \
         {posargs}
 
-[testenv:tensorflow-29]
-basepython = python
-deps =
-    -rdev-requirements.txt
-    tensorflow~=2.9.0
-commands =
-    pytest tests/test_stflow tests/test_optional.py \
-        {posargs}
 
-[testenv:tensorflow-210]
+[testenv:tensorflow-216]
 basepython = python
 deps =
     -rdev-requirements.txt
-    tensorflow~=2.10.0
+    tensorflow~=2.16.0
 commands =
     pytest tests/test_stflow tests/test_optional.py \
         {posargs}
 
-[testenv:tensorflow-211]
-basepython = python
-deps =
-    -rdev-requirements.txt
-    tensorflow~=2.11.0
-commands =
-    pytest tests/test_stflow tests/test_optional.py \
-        {posargs}
 
 [testenv:setup]
 basepython = python