diff --git a/Dockerfile b/Dockerfile
index b309430..cae2012 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9
+FROM registry.kmlabz.com/birbnetes/ai-base-image
 
 ADD svm_prefilter_service requirements.txt uwsgi.ini /svm_prefilter_service/
 WORKDIR /svm_prefilter_service/
diff --git a/requirements.txt b/requirements.txt
index 3d38cc3..c429a12 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,22 +17,24 @@ cython
 six
 deprecation
 
-cycler~=0.10.0
-
+cycler==0.10.0
+deprecation==2.0.7
 eyeD3==0.9.5
 filetype==1.0.6
 hmmlearn==0.2.3
-joblib~=1.0.1
-kiwisolver~=1.2.0
-matplotlib~=3.3.3
-numpy~=1.20.3
+joblib==0.14.1
+kiwisolver==1.2.0
+matplotlib==3.2.1
+numpy==1.18.2
 pydub==0.23.1
 pyparsing==2.4.6
 python-dateutil==2.8.1
-scikit-learn~=0.24.0
-scipy~=1.6.2
-simplejson~=3.17.2
+scikit-learn==0.21.3
+scipy==1.4.1
+simplejson==3.17.0
+six==1.14.0
 plotly
 
 pyAudioAnalysis~=0.3.0
-tqdm~=4.61.1
\ No newline at end of file
+tqdm==4.61.1
+
diff --git a/svm_prefilter_service/mule.py b/svm_prefilter_service/mule.py
index cc862fa..5220212 100644
--- a/svm_prefilter_service/mule.py
+++ b/svm_prefilter_service/mule.py
@@ -22,6 +22,13 @@ if Config.SENTRY_DSN:
     )
 
 
+def json_datetime_dumper(o):
+    if hasattr(o, "isoformat"):
+        return o.isoformat()
+    else:
+        return str(o)
+
+
 class ModelMemer:
 
     def __init__(self):
@@ -41,13 +48,13 @@ class ModelMemer:
         r.raise_for_status()
         self.model_details = r.json()
 
-        r = requests.get(urljoin(Config.MODEL_INFO_URL,self.model_details['files']['model']))
+        r = requests.get(urljoin(Config.MODEL_INFO_URL, self.model_details['files']['model']))
         r.raise_for_status()
 
         with open(model_file, 'wb') as f:
             f.write(r.content)
 
-        r = requests.get(urljoin(Config.MODEL_INFO_URL,self.model_details['files']['means']))
+        r = requests.get(urljoin(Config.MODEL_INFO_URL, self.model_details['files']['means']))
         r.raise_for_status()
 
         with open(means_file, 'wb') as f:
@@ -123,7 +130,7 @@ def main():
                         'audio/wave',
                         {'Content-length': os.path.getsize(audio_file_path)}
                     ),
-                    "description": (None, json.dumps(description), "application/json")
+                    "description": (None, json.dumps(description, default=json_datetime_dumper), "application/json")
                 }
 
                 r = requests.post(Config.INPUT_SERVICE_URL, files=files)
diff --git a/svm_prefilter_service/views/filter_view.py b/svm_prefilter_service/views/filter_view.py
index 7a34a23..d7f8438 100644
--- a/svm_prefilter_service/views/filter_view.py
+++ b/svm_prefilter_service/views/filter_view.py
@@ -36,8 +36,9 @@ class FilterView(FlaskView):
                 current_app.logger.exception(e)
                 return abort(417, 'Input JSON schema invalid')
 
-        soundfile_handle, soundfile_path = tempfile.mkstemp()
-        soundfile.save(open(soundfile_handle, "wb+"))
+        soundfile_handle, soundfile_path = tempfile.mkstemp(suffix=".wav")
+        with open(soundfile_handle, "wb+") as f:
+            soundfile.save(f)
 
         task = {
             "audio_file_path": soundfile_path,
diff --git a/uwsgi.ini b/uwsgi.ini
index 21b0263..33a5cd3 100644
--- a/uwsgi.ini
+++ b/uwsgi.ini
@@ -9,4 +9,5 @@ die-on-term = true
 
 manage-script-name = true
 mount=/=app:app
-mule=mule.py
\ No newline at end of file
+mule=mule.py
+uid=33