diff --git a/argos/server/migrations/versions/64f73a79b7d8_add_ip_version_to_checks.py b/argos/server/migrations/versions/64f73a79b7d8_add_ip_version_to_checks.py
index 6eeddb8..0cd752a 100644
--- a/argos/server/migrations/versions/64f73a79b7d8_add_ip_version_to_checks.py
+++ b/argos/server/migrations/versions/64f73a79b7d8_add_ip_version_to_checks.py
@@ -8,6 +8,7 @@ Create Date: 2024-12-02 14:12:40.558033
 from typing import Sequence, Union
 
 from alembic import op
+from sqlalchemy.dialects.postgresql import ENUM
 import sqlalchemy as sa
 
 
@@ -19,14 +20,15 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
+    enum = ENUM("4", "6", name="ip_version_enum", create_type=False)
+    enum.create(op.get_bind(), checkfirst=False)
     with op.batch_alter_table("tasks", schema=None) as batch_op:
         batch_op.add_column(
-            sa.Column(
-                "ip_version", sa.Enum("4", "6"), server_default="4", nullable=False
-            )
+            sa.Column("ip_version", enum, server_default="4", nullable=False)
         )
 
 
 def downgrade() -> None:
     with op.batch_alter_table("tasks", schema=None) as batch_op:
         batch_op.drop_column("ip_version")
+        ENUM(name="ip_version_enum").drop(op.get_bind(), checkfirst=False)
diff --git a/argos/server/models.py b/argos/server/models.py
index 6fd7b6c..c503e20 100644
--- a/argos/server/models.py
+++ b/argos/server/models.py
@@ -48,7 +48,7 @@ class Task(Base):
     url: Mapped[str] = mapped_column()
     domain: Mapped[str] = mapped_column()
     ip_version: Mapped[IPVersion] = mapped_column(
-        Enum("4", "6"),
+        Enum("4", "6", name="ip_version_enum"),
     )
     check: Mapped[str] = mapped_column()
     expected: Mapped[str] = mapped_column()