diff --git a/admyral/db/alembic/versions/7985f1c159a3_switch_to_timezone_aware_datetime_.py b/admyral/db/alembic/versions/7985f1c159a3_switch_to_timezone_aware_datetime_.py
new file mode 100644
index 00000000..a80a4e34
--- /dev/null
+++ b/admyral/db/alembic/versions/7985f1c159a3_switch_to_timezone_aware_datetime_.py
@@ -0,0 +1,516 @@
+"""switch to timezone aware datetime objects
+
+Revision ID: 7985f1c159a3
+Revises: 45c7ea136fad
+Create Date: 2024-11-13 16:27:08.719491
+
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel  # noqa F401
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = "7985f1c159a3"
+down_revision: Union[str, None] = "45c7ea136fad"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column(
+        "Account",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "Account",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "Session",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "Session",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "User",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "User",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "User",
+        "email_verified",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "api_keys",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "api_keys",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "pip_lockfile_cache",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "pip_lockfile_cache",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "pip_lockfile_cache",
+        "expiration_time",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "python_actions",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "python_actions",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "secrets",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "secrets",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_controls_results",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "workflow_controls_results",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "workflow_run_steps",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_run_steps",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_runs",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_runs",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_runs",
+        "completed_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "workflow_runs",
+        "failed_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "workflow_runs",
+        "canceled_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "workflow_schedules",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_schedules",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_webhooks",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_webhooks",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflows",
+        "created_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflows",
+        "updated_at",
+        existing_type=postgresql.TIMESTAMP(),
+        type_=sa.TIMESTAMP(timezone=True),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column(
+        "workflows",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflows",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_webhooks",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_webhooks",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_schedules",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_schedules",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_runs",
+        "canceled_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "workflow_runs",
+        "failed_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "workflow_runs",
+        "completed_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "workflow_runs",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_runs",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_run_steps",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_run_steps",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "workflow_controls_results",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "workflow_controls_results",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "secrets",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "secrets",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "python_actions",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "python_actions",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "pip_lockfile_cache",
+        "expiration_time",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "pip_lockfile_cache",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "pip_lockfile_cache",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("CURRENT_TIMESTAMP"),
+    )
+    op.alter_column(
+        "api_keys",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "api_keys",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "User",
+        "email_verified",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=True,
+    )
+    op.alter_column(
+        "User",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "User",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "Session",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "Session",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "Account",
+        "updated_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    op.alter_column(
+        "Account",
+        "created_at",
+        existing_type=sa.TIMESTAMP(timezone=True),
+        type_=postgresql.TIMESTAMP(),
+        existing_nullable=False,
+        existing_server_default=sa.text("now()"),
+    )
+    # ### end Alembic commands ###
diff --git a/admyral/db/schemas/auth_schemas.py b/admyral/db/schemas/auth_schemas.py
index 2145b0ea..2dbf3fbd 100644
--- a/admyral/db/schemas/auth_schemas.py
+++ b/admyral/db/schemas/auth_schemas.py
@@ -29,7 +29,9 @@ class UserSchema(BaseSchema, table=True):
     id: str = Field(sa_type=TEXT(), primary_key=True)
     name: str | None = Field(sa_type=TEXT(), nullable=True)
     email: str = Field(sa_type=TEXT())
-    email_verified: datetime | None = Field(sa_type=TIMESTAMP(), nullable=True)
+    email_verified: datetime | None = Field(
+        sa_type=TIMESTAMP(timezone=True), nullable=True
+    )
     image: str | None = Field(sa_type=TEXT(), nullable=True)
 
     # relationship children
diff --git a/admyral/db/schemas/base_schemas.py b/admyral/db/schemas/base_schemas.py
index c7824ba3..1040db27 100644
--- a/admyral/db/schemas/base_schemas.py
+++ b/admyral/db/schemas/base_schemas.py
@@ -9,10 +9,12 @@
 
 class BaseSchema(SQLModel, table=False):
     created_at: datetime = Field(
-        sa_type=TIMESTAMP(), sa_column_kwargs=dict(server_default=func.now())
+        sa_type=TIMESTAMP(timezone=True),
+        sa_column_kwargs=dict(server_default=func.now()),
     )
     updated_at: datetime = Field(
-        sa_type=TIMESTAMP(), sa_column_kwargs=dict(server_default=func.now())
+        sa_type=TIMESTAMP(timezone=True),
+        sa_column_kwargs=dict(server_default=func.now()),
     )
 
     @abstractmethod
diff --git a/admyral/db/schemas/pip_lockfile_cache_schemas.py b/admyral/db/schemas/pip_lockfile_cache_schemas.py
index f975f603..c4314c45 100644
--- a/admyral/db/schemas/pip_lockfile_cache_schemas.py
+++ b/admyral/db/schemas/pip_lockfile_cache_schemas.py
@@ -18,7 +18,7 @@ class PipLockfileCacheSchema(BaseSchema, table=True):
 
     # other fields
     lockfile: str = Field(sa_type=TEXT())
-    expiration_time: datetime = Field(sa_type=TIMESTAMP())
+    expiration_time: datetime = Field(sa_type=TIMESTAMP(timezone=True))
 
     def to_model(self) -> PipLockfile:
         return PipLockfile.model_validate(
diff --git a/admyral/db/schemas/workflow_run_schemas.py b/admyral/db/schemas/workflow_run_schemas.py
index 4571858b..b6772272 100644
--- a/admyral/db/schemas/workflow_run_schemas.py
+++ b/admyral/db/schemas/workflow_run_schemas.py
@@ -34,9 +34,13 @@ class WorkflowRunSchema(BaseSchema, table=True):
 
     # other fields
     source_name: str = Field(sa_type=TEXT())
-    completed_at: datetime | None = Field(sa_type=TIMESTAMP(), nullable=True)
-    failed_at: datetime | None = Field(sa_type=TIMESTAMP(), nullable=True)
-    canceled_at: datetime | None = Field(sa_type=TIMESTAMP(), nullable=True)
+    completed_at: datetime | None = Field(
+        sa_type=TIMESTAMP(timezone=True), nullable=True
+    )
+    failed_at: datetime | None = Field(sa_type=TIMESTAMP(timezone=True), nullable=True)
+    canceled_at: datetime | None = Field(
+        sa_type=TIMESTAMP(timezone=True), nullable=True
+    )
 
     # relationship parents
     workflow: "WorkflowSchema" = Relationship(back_populates="workflow_runs")