diff --git a/tests/plugins/my_plugin.py b/tests/plugins/my_plugin.py
index 767c363d..cd2c8e23 100644
--- a/tests/plugins/my_plugin.py
+++ b/tests/plugins/my_plugin.py
@@ -29,7 +29,7 @@ def prepare_connection(conn, database, datasette):
 def extra_css_urls(template, database, table, view_name, columns, request, datasette):
     async def inner():
         return [
-            "https://plugin-example.com/{}/extra-css-urls-demo.css".format(
+            "https://plugin-example.datasette.io/{}/extra-css-urls-demo.css".format(
                 base64.b64encode(
                     json.dumps(
                         {
@@ -57,10 +57,10 @@ def extra_css_urls(template, database, table, view_name, columns, request, datas
 def extra_js_urls():
     return [
         {
-            "url": "https://plugin-example.com/jquery.js",
+            "url": "https://plugin-example.datasette.io/jquery.js",
             "sri": "SRIHASH",
         },
-        "https://plugin-example.com/plugin1.js",
+        "https://plugin-example.datasette.io/plugin1.js",
     ]
 
 
diff --git a/tests/plugins/my_plugin_2.py b/tests/plugins/my_plugin_2.py
index 7d8095ed..6cd222e6 100644
--- a/tests/plugins/my_plugin_2.py
+++ b/tests/plugins/my_plugin_2.py
@@ -8,10 +8,10 @@ import json
 def extra_js_urls():
     return [
         {
-            "url": "https://plugin-example.com/jquery.js",
+            "url": "https://plugin-example.datasette.io/jquery.js",
             "sri": "SRIHASH",
         },
-        "https://plugin-example.com/plugin2.js",
+        "https://plugin-example.datasette.io/plugin2.js",
     ]
 
 
diff --git a/tests/test_html.py b/tests/test_html.py
index 7c068085..79b6138d 100644
--- a/tests/test_html.py
+++ b/tests/test_html.py
@@ -1454,7 +1454,7 @@ def test_base_url_config(app_client_base_url_prefix, path):
                 "https://github.com/simonw/datasette/blob/master/tests/fixtures.py",
                 "/login-as-root",  # Only used for the latest.datasette.io demo
             }
-            and not href.startswith("https://plugin-example.com/")
+            and not href.startswith("https://plugin-example.datasette.io/")
         ):
             # If this has been made absolute it may start http://localhost/
             if href.startswith("http://localhost/"):
diff --git a/tests/test_plugins.py b/tests/test_plugins.py
index 6a4ea60a..5e3d6dc3 100644
--- a/tests/test_plugins.py
+++ b/tests/test_plugins.py
@@ -125,7 +125,7 @@ def test_hook_extra_js_urls(app_client):
         == {
             "integrity": "SRIHASH",
             "crossorigin": "anonymous",
-            "src": "https://plugin-example.com/jquery.js",
+            "src": "https://plugin-example.datasette.io/jquery.js",
         }
     ]
 
@@ -135,7 +135,7 @@ def test_plugins_with_duplicate_js_urls(app_client):
     response = app_client.get("/fixtures")
     # This test is a little tricky, as if the user has any other plugins in
     # their current virtual environment those may affect what comes back too.
-    # What matters is that https://plugin-example.com/jquery.js is only there once
+    # What matters is that https://plugin-example.datasette.io/jquery.js is only there once
     # and it comes before plugin1.js and plugin2.js which could be in either
     # order
     scripts = Soup(response.body, "html.parser").findAll("script")
@@ -143,16 +143,16 @@ def test_plugins_with_duplicate_js_urls(app_client):
     # No duplicates allowed:
     assert len(srcs) == len(set(srcs))
     # jquery.js loaded once:
-    assert 1 == srcs.count("https://plugin-example.com/jquery.js")
+    assert 1 == srcs.count("https://plugin-example.datasette.io/jquery.js")
     # plugin1.js and plugin2.js are both there:
-    assert 1 == srcs.count("https://plugin-example.com/plugin1.js")
-    assert 1 == srcs.count("https://plugin-example.com/plugin2.js")
+    assert 1 == srcs.count("https://plugin-example.datasette.io/plugin1.js")
+    assert 1 == srcs.count("https://plugin-example.datasette.io/plugin2.js")
     # jquery comes before them both
-    assert srcs.index("https://plugin-example.com/jquery.js") < srcs.index(
-        "https://plugin-example.com/plugin1.js"
+    assert srcs.index("https://plugin-example.datasette.io/jquery.js") < srcs.index(
+        "https://plugin-example.datasette.io/plugin1.js"
     )
-    assert srcs.index("https://plugin-example.com/jquery.js") < srcs.index(
-        "https://plugin-example.com/plugin2.js"
+    assert srcs.index("https://plugin-example.datasette.io/jquery.js") < srcs.index(
+        "https://plugin-example.datasette.io/plugin2.js"
     )