diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index aa9c532..2429457 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,6 +11,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+        datasette-version: ["<1.0", ">=1.0a20"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
@@ -22,6 +23,7 @@ jobs:
     - name: Install dependencies
       run: |
         pip install '.[test]'
+        pip install "datasette${{ matrix.datasette-version }}"
     - name: Run tests
       run: |
         python -m pytest
diff --git a/Justfile b/Justfile
new file mode 100644
index 0000000..4626b32
--- /dev/null
+++ b/Justfile
@@ -0,0 +1,5 @@
+set positional-arguments
+
+test *args:
+    uv run --isolated --with 'datasette<1.0' --with-editable '.[test]' -- python -m pytest
+    uv run --isolated --with 'datasette>=1.0a20' --with-editable '.[test]' -- python -m pytest
diff --git a/tests/test_datasette_auth_github.py b/tests/test_datasette_auth_github.py
index 84eb8ab..ab8a970 100644
--- a/tests/test_datasette_auth_github.py
+++ b/tests/test_datasette_auth_github.py
@@ -197,7 +197,11 @@ async def test_database_access_permissions(
         )
         cookies = {"ds_actor": auth_response.cookies["ds_actor"]}
     databases = await ds.client.get("/.json", cookies=cookies)
-    assert set(databases.json()["databases"].keys()) == expected_databases
+    # This differs between Datasette <1.0 and >=1.0a20
+    if "databases" in databases.json():
+        assert set(databases.json()["databases"].keys()) == expected_databases
+    else:
+        assert set(databases.json().keys()) == expected_databases
 
 
 @pytest.mark.asyncio