diff --git a/BookingSystem/app.py b/BookingSystem/app.py
index 97d5546..1507797 100644
--- a/BookingSystem/app.py
+++ b/BookingSystem/app.py
@@ -6,6 +6,7 @@
 from dateutil import parser
 from flask_compress import Compress
 from flask_minify import Minify
+from flask_session import Session
 from werkzeug.middleware.proxy_fix import ProxyFix
 
 import api
@@ -17,7 +18,6 @@
 import user
 from __init__ import logger, REGEX_ID, REGEX_ITEM, MIN_DAYS, MAX_DAYS, MIN_LABELS, MAX_LABELS, DEBUG, MOCK_DATA
 from db import init_db, Settings
-from flask_session import Session
 
 
 def create_app() -> flask.Flask:
@@ -26,7 +26,6 @@ def create_app() -> flask.Flask:
 
     app.secret_key = os.getenv('SECRET_KEY')
     app.config['SESSION_TYPE'] = 'filesystem'
-    app.config['PERMANENT_SESSION_LIFETIME'] = 3600
     if os.getenv('DEBUG') == 'True':
         app.debug = True
 
diff --git a/Dockerfile b/Dockerfile
index 495c8b0..896b1ae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,7 @@ ENV MIN_DAYS='1'
 ENV MAX_DAYS='90'
 ENV MIN_LABELS='0'
 ENV MAX_LABELS='10'
+ENV SECRET_KEY='SuperSecretKeyHere'
 
 # FEIDE OAuth2
 ENV FEIDE_REDIRECT_URI='https://<fqdn>/login/feide/callback'
diff --git a/docker-compose.yml b/docker-compose.yml
index 2df7e71..fbdfd6a 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -25,6 +25,7 @@ services:
       # Global settings
       - MAX_DAYS=14 # Maximum days equipment can be borrowed
       - MAX_LABELS=10 # Maximum number of labels that can be printed at a time
+      - SECRET_KEY=SuperSecretKey # Random string for session security
 
       # Teams Webhooks (for sending notifications to teams channel) - comma separated
       - TEAMS_WEBHOOKS=