diff --git a/.github/workflows/test-mysql.yml b/.github/workflows/test-mysql.yml
index f972f4f..d8b1929 100644
--- a/.github/workflows/test-mysql.yml
+++ b/.github/workflows/test-mysql.yml
@@ -10,7 +10,7 @@ on:
 
 jobs:
   test-mysql:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       max-parallel: 4
       matrix:
diff --git a/.github/workflows/test-pg.yml b/.github/workflows/test-pg.yml
index 397f156..3825da7 100644
--- a/.github/workflows/test-pg.yml
+++ b/.github/workflows/test-pg.yml
@@ -10,7 +10,7 @@ on:
 
 jobs:
   test-pg:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       max-parallel: 4
       matrix:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c43950d..2d6a88c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,7 +10,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       max-parallel: 4
       matrix:
diff --git a/django_hashids/field.py b/django_hashids/field.py
index a63f28f..cf5439b 100644
--- a/django_hashids/field.py
+++ b/django_hashids/field.py
@@ -1,13 +1,13 @@
 from django.conf import settings
 from django.core.exceptions import FieldError
-from django.db.models import Field
+from django.db.models import CharField, Field
 from django.utils.functional import cached_property
 from hashids import Hashids
 
 from .exceptions import ConfigError, RealFieldDoesNotExistError
 
 
-class HashidsField(Field):
+class HashidsField(CharField):
     concrete = False
     allowed_lookups = ("exact", "iexact", "in", "gt", "gte", "lt", "lte", "isnull")
     # these should never change, even when Hashids updates
diff --git a/pyproject.toml b/pyproject.toml
index 4080247..ae7420f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "django-hashids"
-version = "0.7.0"
+version = "0.7.1"
 readme = "README.md"
 description = "Non-intrusive hashids library for Django"
 homepage = "https://github.com/ericls/django-hashids"