diff --git a/backend/Dockerfile b/backend/Dockerfile
index e91276228..c6c4760e7 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -13,14 +13,14 @@ RUN apt-get update && \
     apt-get upgrade --yes && \
     apt-get install --yes \
     ca-certificates \
-    unzip \
-    libpq-dev \
     curl \
+    git-lfs \
+    gnupg \
+    libpq-dev \
     python3 \
     python3-pip \
     python3-venv \
-    gnupg \
-    git-lfs \
+    unzip \
     && rm -rf /var/lib/apt/lists/*
 
 ARG KUBECTL_APT_REMOTE=https://pkgs.k8s.io/core:/stable:/v1.29/deb/
@@ -38,15 +38,15 @@ COPY .git_archival.txt /tmp/.git_archival.txt
 COPY startup.sh /opt/.startup.sh
 
 # Activate venv
-RUN ln -s $(which python3.11) /usr/bin/python && \
-    ln -sf $(which python3.11) /usr/bin/python3 && \
+RUN ln -s "$(which python3.11)" /usr/bin/python && \
+    ln -sf "$(which python3.11)" /usr/bin/python3 && \
     python -m venv /opt/.venv
 ENV _OLD_VIRTUAL_PATH="$PATH"
 ENV VIRTUAL_ENV=/opt/.venv
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
 WORKDIR /tmp/backend
-RUN pip install . && chmod +x $VIRTUAL_ENV/lib/python3.11/site-packages/capellacollab/settings/modelsources/git/askpass.py
+RUN pip install . && chmod +x "$VIRTUAL_ENV/lib/python3.11/site-packages/capellacollab/settings/modelsources/git/askpass.py"
 
 RUN mkdir -p /var/log/backend && \
     chmod -R 777 /var/log/backend
diff --git a/backend/capellacollab/sessions/routes.py b/backend/capellacollab/sessions/routes.py
index 8188bc047..385a4bab3 100644
--- a/backend/capellacollab/sessions/routes.py
+++ b/backend/capellacollab/sessions/routes.py
@@ -468,10 +468,7 @@ def get_sessions_for_user(
     ),
     db: orm.Session = fastapi.Depends(database.get_db),
 ):
-    if (
-        user != current_user
-        and not current_user.role != users_models.Role.ADMIN
-    ):
+    if user != current_user and current_user.role != users_models.Role.ADMIN:
         raise exceptions.SessionForbiddenError()
 
     return user.sessions + list(
diff --git a/backend/tests/sessions/test_session_environment.py b/backend/tests/sessions/test_session_environment.py
index 3009f2ad1..7a530a57a 100644
--- a/backend/tests/sessions/test_session_environment.py
+++ b/backend/tests/sessions/test_session_environment.py
@@ -17,11 +17,6 @@
 from capellacollab.users import models as users_models
 
 
-@pytest.fixture(name="mock_session_methods")
-def fixture_mock_session_methods():
-    pass
-
-
 class MockOperator:
     environment = {}
 
diff --git a/frontend/src/app/events/service/events.service.ts b/frontend/src/app/events/service/events.service.ts
index d9d984bfc..d239baea6 100644
--- a/frontend/src/app/events/service/events.service.ts
+++ b/frontend/src/app/events/service/events.service.ts
@@ -36,7 +36,7 @@ export class EventsService {
       case 'projectName':
         return data.project ? data.project.name : '';
       case 'reason':
-        return data.reason || '';
+        return data.reason ?? '';
       default:
         return '';
     }
diff --git a/images/session-preparation/Dockerfile b/images/session-preparation/Dockerfile
index a3abaace6..ceddb807e 100644
--- a/images/session-preparation/Dockerfile
+++ b/images/session-preparation/Dockerfile
@@ -7,7 +7,11 @@ FROM ${ALPINE_BASE_IMAGE}
 USER root
 
 COPY clone_repositories.py /opt/clone_repositories.py
-RUN apk add --no-cache git git-lfs python3 py3-pip
+RUN apk add --no-cache \
+    git \
+    git-lfs \
+    py3-pip \
+    python3
 
 COPY git_askpass.py /etc/git_askpass.py
 RUN chmod 555 /etc/git_askpass.py