diff --git a/renovate.json b/renovate.json
index 0f7f3840..d1c65268 100644
--- a/renovate.json
+++ b/renovate.json
@@ -2,6 +2,8 @@
     "extends": [
         "github>openfun/renovate-configuration"
     ],
+    "commitMessagePrefix": "⬆️(project)",
+    "commitMessageAction": "upgrade",
     "packageRules": [
         {
             "enabled": false,
diff --git a/src/marion/marion/utils.py b/src/marion/marion/utils.py
index 6a980b6d..ec687458 100644
--- a/src/marion/marion/utils.py
+++ b/src/marion/marion/utils.py
@@ -35,7 +35,8 @@ def static_file_fetcher(url, *args, **kwargs):
 
         path = url_path.replace(settings.STATIC_URL, "", 1)
         try:
-            data["file_obj"] = open(find(path), "rb")
+            with open(find(path), "rb") as opened_path:
+                data["file_obj"] = opened_path
         # A SuspiciousFileOperation is raised by Django if the file has been
         # found outside referenced static file paths. In this case, we ignore
         # this error and fallback to the default Weasyprint fetcher for files
diff --git a/src/marion/setup.cfg b/src/marion/setup.cfg
index e9700f9a..067a0c70 100644
--- a/src/marion/setup.cfg
+++ b/src/marion/setup.cfg
@@ -35,26 +35,26 @@ dev =
     bandit==1.7.0
     black==20.8b1
     factory_boy==3.2.0
-    flake8==3.9.1
-    hypothesis[django]==6.10.0
-    isort==5.8.0
-    Jinja2==2.11.3
-    mkdocs==1.1.2
-    mkdocs-material==7.1.2
-    mkdocstrings==0.15.0
+    flake8==3.9.2
+    hypothesis[django]==6.18.0
+    isort==5.9.3
+    Jinja2==3.0.1
+    mkdocs==1.2.2
+    mkdocs-material==7.2.6
+    mkdocstrings==0.15.2
     pdfminer.six==20201018
-    pyfakefs==4.4.0
-    pylint==2.7.4
-    pylint-django==2.4.3
-    pytest==6.2.3
-    pytest-cov==2.11.1
-    pytest-django==4.2.0
+    pyfakefs==4.5.1
+    pylint==2.10.2
+    pylint-django==2.4.4
+    pytest==6.2.5
+    pytest-cov==2.12.1
+    pytest-django==4.4.0
 sandbox =
-    Django==3.2
+    Django==3.2.7
     django-configurations==2.2
-    psycopg2-binary==2.8.6
+    psycopg2-binary==2.9.1
 ci =
-    twine==3.4.1
+    twine==3.4.2
 
 [bdist_wheel]
 universal = 1