diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9b0bdd7..105760b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Change log
 
+## v0.9.1
+
+* (Bug fix) Retries in POST/PUTs to REST APIs didn't happen.
+* Warn users if `allow_pickle=True` is required.
+
 ## v0.9.0
 
 * Set status to `failed` or `terminated` if the context manager is used and there is an exception.
diff --git a/simvue/api.py b/simvue/api.py
index 435664c4..9a09c06e 100644
--- a/simvue/api.py
+++ b/simvue/api.py
@@ -28,6 +28,7 @@ def post(url, headers, data, is_json=True):
         data = json.dumps(data)
         headers = set_json_header(headers)
     response = requests.post(url, headers=headers, data=data, timeout=DEFAULT_API_TIMEOUT)
+    response.raise_for_status()
 
     return response
 
@@ -41,5 +42,6 @@ def put(url, headers, data, is_json=True, timeout=DEFAULT_API_TIMEOUT):
         data = json.dumps(data)
         headers = set_json_header(headers)
     response = requests.put(url, headers=headers, data=data, timeout=timeout)
+    response.raise_for_status()
 
     return response
diff --git a/simvue/run.py b/simvue/run.py
index 5a8dde44..2d0dd4ca 100644
--- a/simvue/run.py
+++ b/simvue/run.py
@@ -557,6 +557,8 @@ def save(self, filename, category, filetype=None, preserve_path=False, name=None
 
         if not is_file:
             data['pickled'], data['type'] = Serializer().serialize(filename, allow_pickle)
+            if not data['type'] and not allow_pickle:
+                self._error('Unable to save Python object, set allow_pickle to True')
             data['checksum'] = calculate_sha256(data['pickled'], False)
             data['originalPath'] = ''
             data['size'] = sys.getsizeof(data['pickled'])