diff --git a/argos/server/migrations/versions/defda3f2952d_add_on_delete_cascade_to_results_task_id.py b/argos/server/migrations/versions/defda3f2952d_add_on_delete_cascade_to_results_task_id.py
index 6767757..71795f4 100644
--- a/argos/server/migrations/versions/defda3f2952d_add_on_delete_cascade_to_results_task_id.py
+++ b/argos/server/migrations/versions/defda3f2952d_add_on_delete_cascade_to_results_task_id.py
@@ -18,16 +18,20 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
+    bind = op.get_bind()
     with op.batch_alter_table("results", schema=None) as batch_op:
-        batch_op.drop_constraint("results_task_id_fkey", type_="foreignkey")
+        if bind.engine.name != "sqlite":
+            batch_op.drop_constraint("results_task_id_fkey", type_="foreignkey")
         batch_op.create_foreign_key(
             "results_task_id_fkey", "tasks", ["task_id"], ["id"], ondelete="CASCADE"
         )
 
 
 def downgrade() -> None:
+    bind = op.get_bind()
     with op.batch_alter_table("results", schema=None) as batch_op:
-        batch_op.drop_constraint("results_task_id_fkey", type_="foreignkey")
+        if bind.engine.name != "sqlite":
+            batch_op.drop_constraint("results_task_id_fkey", type_="foreignkey")
         batch_op.create_foreign_key(
             "results_task_id_fkey", "tasks", ["task_id"], ["id"]
         )
diff --git a/argos/server/migrations/versions/e99bc35702c9_add_severity_to_task_and_add_severity_.py b/argos/server/migrations/versions/e99bc35702c9_add_severity_to_task_and_add_severity_.py
index 9f117aa..265c20f 100644
--- a/argos/server/migrations/versions/e99bc35702c9_add_severity_to_task_and_add_severity_.py
+++ b/argos/server/migrations/versions/e99bc35702c9_add_severity_to_task_and_add_severity_.py
@@ -19,7 +19,9 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
-    op.execute("ALTER TYPE severity ADD VALUE 'unknown'")
+    bind = op.get_bind()
+    if bind.engine.name != "sqlite":
+        op.execute("ALTER TYPE severity ADD VALUE 'unknown'")
     op.add_column(
         "tasks",
         sa.Column(