diff --git a/safe_transaction_service/account_abstraction/migrations/0001_initial.py b/safe_transaction_service/account_abstraction/migrations/0001_initial.py
index ba555b532..882bfa276 100644
--- a/safe_transaction_service/account_abstraction/migrations/0001_initial.py
+++ b/safe_transaction_service/account_abstraction/migrations/0001_initial.py
@@ -1,4 +1,4 @@
-# Generated by Django 4.2.10 on 2024-03-08 15:36
+# Generated by Django 5.0.3 on 2024-03-25 13:34
 
 import django.db.models.deletion
 import django.utils.timezone
@@ -10,10 +10,11 @@
 
 
 class Migration(migrations.Migration):
+
     initial = True
 
     dependencies = [
-        ("history", "0079_alter_erc20transfer_unique_together_and_more"),
+        ("history", "0080_alter_multisigconfirmation_signature"),
     ]
 
     operations = [
@@ -53,6 +54,66 @@ class Migration(migrations.Migration):
                 "abstract": False,
             },
         ),
+        migrations.CreateModel(
+            name="SafeOperationConfirmation",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "created",
+                    model_utils.fields.AutoCreatedField(
+                        default=django.utils.timezone.now,
+                        editable=False,
+                        verbose_name="created",
+                    ),
+                ),
+                (
+                    "modified",
+                    model_utils.fields.AutoLastModifiedField(
+                        default=django.utils.timezone.now,
+                        editable=False,
+                        verbose_name="modified",
+                    ),
+                ),
+                ("owner", gnosis.eth.django.models.EthereumAddressV2Field()),
+                (
+                    "signature",
+                    gnosis.eth.django.models.HexV2Field(
+                        default=None, max_length=5000, null=True
+                    ),
+                ),
+                (
+                    "signature_type",
+                    models.PositiveSmallIntegerField(
+                        choices=[
+                            (0, "CONTRACT_SIGNATURE"),
+                            (1, "APPROVED_HASH"),
+                            (2, "EOA"),
+                            (3, "ETH_SIGN"),
+                        ],
+                        db_index=True,
+                    ),
+                ),
+                (
+                    "safe_operation",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="confirmations",
+                        to="account_abstraction.safeoperation",
+                    ),
+                ),
+            ],
+            options={
+                "ordering": ["created"],
+            },
+        ),
         migrations.CreateModel(
             name="UserOperation",
             fields=[
@@ -100,6 +161,15 @@ class Migration(migrations.Migration):
                 ),
             ],
         ),
+        migrations.AddField(
+            model_name="safeoperation",
+            name="user_operation",
+            field=models.OneToOneField(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="safe_operation",
+                to="account_abstraction.useroperation",
+            ),
+        ),
         migrations.CreateModel(
             name="UserOperationReceipt",
             fields=[
@@ -127,73 +197,11 @@ class Migration(migrations.Migration):
                 ),
             ],
         ),
-        migrations.CreateModel(
-            name="SafeOperationConfirmation",
-            fields=[
-                (
-                    "id",
-                    models.BigAutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                (
-                    "created",
-                    model_utils.fields.AutoCreatedField(
-                        default=django.utils.timezone.now,
-                        editable=False,
-                        verbose_name="created",
-                    ),
-                ),
-                (
-                    "modified",
-                    model_utils.fields.AutoLastModifiedField(
-                        default=django.utils.timezone.now,
-                        editable=False,
-                        verbose_name="modified",
-                    ),
-                ),
-                ("owner", gnosis.eth.django.models.EthereumAddressV2Field()),
-                (
-                    "signature",
-                    gnosis.eth.django.models.HexField(
-                        default=None, max_length=5000, null=True
-                    ),
-                ),
-                (
-                    "signature_type",
-                    models.PositiveSmallIntegerField(
-                        choices=[
-                            (0, "CONTRACT_SIGNATURE"),
-                            (1, "APPROVED_HASH"),
-                            (2, "EOA"),
-                            (3, "ETH_SIGN"),
-                        ],
-                        db_index=True,
-                    ),
-                ),
-                (
-                    "safe_operation",
-                    models.ForeignKey(
-                        on_delete=django.db.models.deletion.CASCADE,
-                        related_name="confirmations",
-                        to="account_abstraction.safeoperation",
-                    ),
-                ),
-            ],
-            options={
-                "ordering": ["created"],
-            },
-        ),
-        migrations.AddField(
-            model_name="safeoperation",
-            name="user_operation",
-            field=models.OneToOneField(
-                on_delete=django.db.models.deletion.CASCADE,
-                related_name="safe_operation",
-                to="account_abstraction.useroperation",
+        migrations.AddConstraint(
+            model_name="safeoperationconfirmation",
+            constraint=models.UniqueConstraint(
+                fields=("safe_operation", "owner"),
+                name="unique_safe_operation_owner_confirmation",
             ),
         ),
         migrations.AddIndex(
@@ -206,11 +214,4 @@ class Migration(migrations.Migration):
             name="useroperation",
             unique_together={("sender", "nonce")},
         ),
-        migrations.AddConstraint(
-            model_name="safeoperationconfirmation",
-            constraint=models.UniqueConstraint(
-                fields=("safe_operation", "owner"),
-                name="unique_safe_operation_owner_confirmation",
-            ),
-        ),
     ]
diff --git a/safe_transaction_service/account_abstraction/models.py b/safe_transaction_service/account_abstraction/models.py
index bc17b0832..6bedc1c75 100644
--- a/safe_transaction_service/account_abstraction/models.py
+++ b/safe_transaction_service/account_abstraction/models.py
@@ -12,7 +12,7 @@
 from gnosis.eth.account_abstraction import UserOperationMetadata
 from gnosis.eth.django.models import (
     EthereumAddressV2Field,
-    HexField,
+    HexV2Field,
     Keccak256Field,
     Uint256Field,
 )