diff --git a/vreapis/containerizer/views.py b/vreapis/containerizer/views.py
index 4d74259..6432af6 100644
--- a/vreapis/containerizer/views.py
+++ b/vreapis/containerizer/views.py
@@ -30,6 +30,7 @@
 import jsonschema
 from slugify import slugify
 from github import Github, UnknownObjectException
+from django.conf import settings
 
 from catalog.serializers import CellSerializer
 from containerizer.RContainerizer import RContainerizer
@@ -94,8 +95,7 @@ def post(self, request: Request):
         # common.logger.debug('ExtractorHandler. payload: ' + json.dumps(payload, indent=4))
         if 'rmarkdown' in payload:
             # Directly setting `NotebookNode.metadata['jupytext'] = {'split_at_heading': True, }` has no use. I don't know why. So we don't use lib jupytext here.
-            venv_activator = '/opt/venv/bin/activate'
-            command_jupytext = f'source {venv_activator}; jupytext --from Rmd --to ipynb --opt split_at_heading=true -o -'
+            command_jupytext = f'source {settings.VENV_ACTIVATOR}; jupytext --from Rmd --to ipynb --opt split_at_heading=true -o -'
             process_jupytext = subprocess.Popen(command_jupytext, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, executable='/bin/bash')
             stdout, stderr = process_jupytext.communicate(input=payload['rmarkdown'].encode())
             process_jupytext.stdin.close()
diff --git a/vreapis/vreapis/settings/base.py b/vreapis/vreapis/settings/base.py
index 026df70..7299ea7 100644
--- a/vreapis/vreapis/settings/base.py
+++ b/vreapis/vreapis/settings/base.py
@@ -188,7 +188,7 @@
     STATIC_URL = f'{BASE_PATH}/static/'
 STATIC_ROOT = BASE_DIR / "staticfiles"
 
-# CUSTOM VARS
+# CUSTOM VARS # todo. delete default values
 
 API_ENDPOINT: str = os.getenv('API_ENDPOINT', "https://naavre-dev.minikube.test/vre-api-test")
 
@@ -199,3 +199,5 @@
 KEYCLOAK_CLIENT_ID: str = os.getenv('KEYCLOAK_CLIENT_ID', 'myclient')
 
 NAAVRE_API_TOKEN: str = os.getenv('NAAVRE_API_TOKEN')
+
+VENV_ACTIVATOR: str = os.getenv('VENV_ACTIVATOR', '/opt/venv/bin/activate')