diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 933cf08..06a3c1c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -46,7 +46,7 @@ build_docker:
 build_wheel:
   stage: build
   script:
-  - python3.6 setup.py egg_info bdist_wheel
+  - python3.7 setup.py egg_info bdist_wheel
   - cd dist
   - sha256sum *.whl > SHA256SUMS
   artifacts:
@@ -71,16 +71,16 @@ build_debian:
   - gzip -9n package/debian/matemat/usr/share/doc/matemat/changelog
   - cp -r static/ package/debian/matemat/usr/lib/matemat/static/
   - cp -r templates/ package/debian/matemat/usr/lib/matemat/templates/
-  - python3.6 setup.py egg_info install --root=package/debian/matemat/ --prefix=/usr --optimize=1
+  - python3.7 setup.py egg_info install --root=package/debian/matemat/ --prefix=/usr --optimize=1
   - cd package/debian
   - mkdir -p matemat/usr/lib/python3/dist-packages/
-  - rsync -a matemat/usr/lib/python3.6/site-packages/ matemat/usr/lib/python3/dist-packages/
-  - rm -rf matemat/usr/lib/python3.6/
+  - rsync -a matemat/usr/lib/python3.7/site-packages/ matemat/usr/lib/python3/dist-packages/
+  - rm -rf matemat/usr/lib/python3.7/
   - find matemat/usr/lib/python3/dist-packages -name __pycache__ -exec rm -r {} \; 2>/dev/null || true
   - find matemat/usr/lib/python3/dist-packages -name '*.pyc' -exec rm {} \;
   - mv matemat/usr/bin/matemat matemat/usr/lib/matemat/matemat
   - rm -rf matemat/usr/bin
-  - sed -re 's$#!/usr/local/bin/python3.6$#!/usr/bin/python3$' -i matemat/usr/lib/matemat/matemat
+  - sed -re 's$#!/usr/local/bin/python3.7$#!/usr/bin/python3$' -i matemat/usr/lib/matemat/matemat
   - find matemat -type f -exec chmod 0644 {} \;
   - find matemat -type d -exec chmod 755 {} \;
   - chmod +x matemat/usr/lib/matemat/matemat matemat/DEBIAN/postinst matemat/DEBIAN/prerm matemat/DEBIAN/postrm
@@ -99,7 +99,7 @@ build_archlinux:
   stage: build
   image: archlinux/base:latest  # Use an archlinux image instead of the customized debian image.
   script:
-  - pacman -Sy --noconfirm python python-setuptools python-pip python-wheel python-jinja python-pillow python-magic base-devel
+  - pacman -Sy --noconfirm python python-setuptools python-pip python-wheel python-bottle python-jinja python-pillow python-magic base-devel
   - export MATEMAT_VERSION=$(python -c 'import matemat; print(matemat.__version__)')
   - cp -r static/ package/archlinux/matemat/usr/lib/matemat/static/
   - cp -r templates/ package/archlinux/matemat/usr/lib/matemat/templates/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9a2aed..3569157 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,44 @@
 # Matemat Changelog
 
+<!-- BEGIN RELEASE v0.2.3 -->
+## Version 0.2.3
+
+Bugfix fix release
+
+### Changes
+
+<!-- BEGIN CHANGES 0.2.3 -->
+- Fix: Session timeout lead to 500 error
+<!-- END CHANGES 0.2.3 -->
+
+<!-- END RELEASE v0.2.3 -->
+
+<!-- BEGIN RELEASE v0.2.2 -->
+## Version 0.2.2
+
+Security fix release
+
+### Changes
+
+<!-- BEGIN CHANGES 0.2.2 -->
+- Fix: Sessions were shared between clients
+<!-- END CHANGES 0.2.2 -->
+
+<!-- END RELEASE v0.2.2 -->
+
+<!-- BEGIN RELEASE v0.2.1 -->
+## Version 0.2.1
+
+Hotfix release
+
+### Changes
+
+<!-- BEGIN CHANGES 0.2.1 -->
+- Fix: Properly load config
+<!-- END CHANGES 0.2.1 -->
+
+<!-- END RELEASE v0.2.1 -->
+
 <!-- BEGIN RELEASE v0.2 -->
 ## Version 0.2
 
diff --git a/matemat/__init__.py b/matemat/__init__.py
index c1ae7f9..12dad7e 100644
--- a/matemat/__init__.py
+++ b/matemat/__init__.py
@@ -1,2 +1,2 @@
 
-__version__ = '0.2'
+__version__ = '0.2.3'
diff --git a/matemat/__main__.py b/matemat/__main__.py
index 5da5ea8..a5cbe0b 100644
--- a/matemat/__main__.py
+++ b/matemat/__main__.py
@@ -7,7 +7,7 @@ import bottle
 from matemat.db import MatematDatabase
 from matemat.webserver import cron
 from matemat.webserver.logger import Logger
-from matemat.webserver.config import get_config, parse_config_file
+from matemat.webserver.config import get_config, get_app_config, parse_config_file
 from matemat.webserver.template import init as template_init
 
 # Those imports are actually needed, as they implicitly register pagelets.
@@ -18,41 +18,41 @@ from matemat.webserver.pagelets import *
 def _init(config: Dict[str, Any]):
     logger = Logger.instance()
     # Set default values for missing config items
-    if 'InstanceName' not in config:
-        config['InstanceName'] = 'Matemat'
+    if 'InstanceName' not in config['pagelet_variables']:
+        config['pagelet_variables']['InstanceName'] = 'Matemat'
         logger.warning('Property \'InstanceName\' not set, using \'Matemat\'')
-    if 'UploadDir' not in config:
-        config['UploadDir'] = './static/upload/'
+    if 'UploadDir' not in config['pagelet_variables']:
+        config['pagelet_variables']['UploadDir'] = './static/upload/'
         logger.warning('Property \'UploadDir\' not set, using \'./static/upload/\'')
-    if 'DatabaseFile' not in config:
-        config['DatabaseFile'] = './matemat.db'
+    if 'DatabaseFile' not in config['pagelet_variables']:
+        config['pagelet_variables']['DatabaseFile'] = './matemat.db'
         logger.warning('Property \'DatabaseFile\' not set, using \'./matemat.db\'')
-    if 'SmtpSendReceipts' not in config:
-        config['SmtpSendReceipts'] = '0'
+    if 'SmtpSendReceipts' not in config['pagelet_variables']:
+        config['pagelet_variables']['SmtpSendReceipts'] = '0'
         logger.warning('Property \'SmtpSendReceipts\' not set, using \'0\'')
-    if config['SmtpSendReceipts'] == '1':
-        if 'SmtpFrom' not in config:
+    if config['pagelet_variables']['SmtpSendReceipts'] == '1':
+        if 'SmtpFrom' not in config['pagelet_variables']:
             logger.fatal('\'SmtpSendReceipts\' set to \'1\', but \'SmtpFrom\' missing.')
             raise KeyError()
-        if 'SmtpSubj' not in config:
+        if 'SmtpSubj' not in config['pagelet_variables']:
             logger.fatal('\'SmtpSendReceipts\' set to \'1\', but \'SmtpSubj\' missing.')
             raise KeyError()
-        if 'SmtpHost' not in config:
+        if 'SmtpHost' not in config['pagelet_variables']:
             logger.fatal('\'SmtpSendReceipts\' set to \'1\', but \'SmtpHost\' missing.')
             raise KeyError()
-        if 'SmtpPort' not in config:
+        if 'SmtpPort' not in config['pagelet_variables']:
             logger.fatal('\'SmtpSendReceipts\' set to \'1\', but \'SmtpPort\' missing.')
             raise KeyError()
-        if 'SmtpUser' not in config:
+        if 'SmtpUser' not in config['pagelet_variables']:
             logger.fatal('\'SmtpSendReceipts\' set to \'1\', but \'SmtpUser\' missing.')
             raise KeyError()
-        if 'SmtpPass' not in config:
+        if 'SmtpPass' not in config['pagelet_variables']:
             logger.fatal('\'SmtpSendReceipts\' set to \'1\', but \'SmtpPass\' missing.')
             raise KeyError()
-        if 'SmtpEnforceTLS' not in config:
+        if 'SmtpEnforceTLS' not in config['pagelet_variables']:
             config['SmtpEnforceTLS'] = '1'
             logger.warning('Property \'SmtpEnforceTLS\' not set, using \'1\'')
-    with MatematDatabase(config['DatabaseFile']):
+    with MatematDatabase(config['pagelet_variables']['DatabaseFile']):
         # Connect to the database to create it and perform any schema migrations
         pass
     # Initialize Jinaj2 template system
diff --git a/matemat/webserver/session/sessions.py b/matemat/webserver/session/sessions.py
index 55f0549..a3d3672 100644
--- a/matemat/webserver/session/sessions.py
+++ b/matemat/webserver/session/sessions.py
@@ -23,15 +23,18 @@ def start() -> str:
     # Reference date for session timeout
     now = datetime.utcnow()
     # Read the client's session ID, if any
-    session_id = str(request.get_cookie(_COOKIE_NAME, secret=__key))
+    session_id = request.get_cookie(_COOKIE_NAME, secret=__key)
     # If there is no active session, create a new session ID
     if session_id is None:
         session_id = str(uuid4())
+    else:
+        session_id = str(session_id)
 
     # Check for session timeout
     if session_id in __session_vars and __session_vars[session_id][0] < now:
         end(session_id)
-        raise TimeoutError('Session timed out.')
+        # Create new session ID after terminating the previous session
+        session_id = str(uuid4())
     # Update or initialize the session timeout
     if session_id not in __session_vars:
         __session_vars[session_id] = (now + timedelta(seconds=_SESSION_TIMEOUT)), dict()
diff --git a/package/archlinux/PKGBUILD b/package/archlinux/PKGBUILD
index 644b974..68994c7 100644
--- a/package/archlinux/PKGBUILD
+++ b/package/archlinux/PKGBUILD
@@ -2,7 +2,7 @@
 # Maintainer: s3lph <account-gitlab-ideynizv@kernelpanic.lol>
 
 pkgname=matemat
-pkgver=0.1
+pkgver=0.2.3
 pkgrel=1
 arch=('any')
 
@@ -12,7 +12,7 @@ licence=('MIT')
 
 depends=(
     'python'
-    'ptyhon-bottle'
+    'python-bottle'
     'python-jinja'
     'python-pillow'
     'python-magic'
diff --git a/package/debian/matemat/DEBIAN/control b/package/debian/matemat/DEBIAN/control
index ae7a111..ad4b86d 100644
--- a/package/debian/matemat/DEBIAN/control
+++ b/package/debian/matemat/DEBIAN/control
@@ -1,5 +1,5 @@
 Package: matemat
-Version: 0.1
+Version: 0.2.3
 Maintainer: s3lph <account-gitlab-ideynizv@kernelpanic.lol>
 Section: web
 Priority: optional