diff --git a/docs/env.md b/docs/env.md
index 2c1eac07e..a08b6d66a 100644
--- a/docs/env.md
+++ b/docs/env.md
@@ -34,6 +34,7 @@ These are the environment variables you can set for the `impress-backend` contai
 | CACHES_DEFAULT_KEY_PREFIX                       | The prefix used to every cache keys.                                                                                                                                       | docs                                                                    |
 | COLLABORATION_API_URL                           | Collaboration api host                                                                                                                                                     |                                                                         |
 | COLLABORATION_SERVER_SECRET                     | Collaboration api secret                                                                                                                                                   |                                                                         |
+| COLLABORATION_WS_INACTIVITY_TIMEOUT             | Timeout (in seconds) the user is consider as inactive if not activity. The websocket is cloed after this inactivity period. `None` means disabled.                         | None                                                                    |
 | COLLABORATION_WS_NOT_CONNECTED_READY_ONLY       | Users not connected to the collaboration server cannot edit                                                                                                                | false                                                                   |
 | COLLABORATION_WS_URL                            | Collaboration websocket url                                                                                                                                                |                                                                         |
 | CONVERSION_API_CONTENT_FIELD                    | Conversion api content field                                                                                                                                               | content                                                                 |
diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index f39c930e5..77a6f3cf4 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -2831,6 +2831,7 @@ class ConfigView(drf.views.APIView):
             "API_USERS_SEARCH_QUERY_MIN_LENGTH",
             "COLLABORATION_WS_URL",
             "COLLABORATION_WS_NOT_CONNECTED_READY_ONLY",
+            "COLLABORATION_WS_INACTIVITY_TIMEOUT",
             "CONVERSION_FILE_EXTENSIONS_ALLOWED",
             "CONVERSION_FILE_MAX_SIZE",
             "CONVERSION_UPLOAD_ENABLED",
diff --git a/src/backend/core/tests/test_api_config.py b/src/backend/core/tests/test_api_config.py
index 6fb8a30ca..84151df7f 100644
--- a/src/backend/core/tests/test_api_config.py
+++ b/src/backend/core/tests/test_api_config.py
@@ -26,6 +26,7 @@ pytestmark = pytest.mark.django_db
     API_USERS_SEARCH_QUERY_MIN_LENGTH=6,
     COLLABORATION_WS_URL="http://testcollab/",
     COLLABORATION_WS_NOT_CONNECTED_READY_ONLY=True,
+    COLLABORATION_WS_INACTIVITY_TIMEOUT=300,
     CONVERSION_UPLOAD_ENABLED=False,
     CRISP_WEBSITE_ID="123",
     FRONTEND_CSS_URL="http://testcss/",
@@ -55,6 +56,7 @@ def test_api_config(is_authenticated):
         "API_USERS_SEARCH_QUERY_MIN_LENGTH": 6,
         "COLLABORATION_WS_URL": "http://testcollab/",
         "COLLABORATION_WS_NOT_CONNECTED_READY_ONLY": True,
+        "COLLABORATION_WS_INACTIVITY_TIMEOUT": 300,
         "CONVERSION_FILE_EXTENSIONS_ALLOWED": [".docx", ".md"],
         "CONVERSION_FILE_MAX_SIZE": 20971520,
         "CONVERSION_UPLOAD_ENABLED": False,
diff --git a/src/backend/impress/settings.py b/src/backend/impress/settings.py
index 6cd528359..dab41e666 100755
--- a/src/backend/impress/settings.py
+++ b/src/backend/impress/settings.py
@@ -507,6 +507,11 @@ class Base(Configuration):
         environ_name="COLLABORATION_WS_NOT_CONNECTED_READY_ONLY",
         environ_prefix=None,
     )
+    COLLABORATION_WS_INACTIVITY_TIMEOUT = values.IntegerValue(
+        None,
+        environ_name="COLLABORATION_WS_INACTIVITY_TIMEOUT",
+        environ_prefix=None,
+    )
 
     # Frontend
     FRONTEND_THEME = values.Value(