diff --git a/.github/workflows/build_and_push.yaml b/.github/workflows/build_and_push.yaml
index 1a5fca02..efd19e6c 100644
--- a/.github/workflows/build_and_push.yaml
+++ b/.github/workflows/build_and_push.yaml
@@ -15,7 +15,7 @@ jobs:
 
   build:
     name: "Build and Push Application Container Images"
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         include:
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index a56008e7..f1c9c41d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -19,7 +19,7 @@ jobs:
       ./.github/workflows/rebase_checker.yaml
 
   lint:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     needs:
       - rebase-checker
     steps:
@@ -36,7 +36,7 @@ jobs:
         uses: pre-commit/action@v3.0.1
 
   mypy:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ["3.11"]
@@ -60,7 +60,7 @@ jobs:
         run: uv run make typing
 
   test:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ["3.11"]
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 5f429dcf..6efbf8ec 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -17,7 +17,7 @@ env:
 
 jobs:
   release:
-    runs-on: ubuntu-24.04-arm
+    runs-on: ubuntu-latest
     timeout-minutes: 10
     if: >-
       github.event_name == 'pull_request'
diff --git a/src/lsst/cmservice/common/butler.py b/src/lsst/cmservice/common/butler.py
index a359a12c..5ebdab8b 100644
--- a/src/lsst/cmservice/common/butler.py
+++ b/src/lsst/cmservice/common/butler.py
@@ -8,6 +8,7 @@
 
 from lsst.daf.butler import Butler, ButlerConfig, ButlerRepoIndex
 from lsst.daf.butler._exceptions import MissingCollectionError
+from lsst.resources import ResourcePathExpression
 from lsst.utils.db_auth import DbAuth
 
 from ..config import config
@@ -30,7 +31,7 @@ async def get_butler_config(repo: str, *, without_datastore: bool = False) -> Bu
     """
 
     try:
-        repo_uri = BUTLER_REPO_INDEX.get_repo_uri(label=repo)
+        repo_uri: ResourcePathExpression = BUTLER_REPO_INDEX.get_repo_uri(label=repo)
     except KeyError:
         # No such repo known to the service
         logger.warning("Butler repo %s not known to environment.", repo)
diff --git a/src/lsst/cmservice/config.py b/src/lsst/cmservice/config.py
index 1b416ccd..c7048af7 100644
--- a/src/lsst/cmservice/config.py
+++ b/src/lsst/cmservice/config.py
@@ -76,11 +76,6 @@ class ButlerConfiguration(BaseModel):
         default="rubin",
     )
 
-    access_token: str | None = Field(
-        description=("Gafaelfawr access token used to authenticate to a Butler server."),
-        default=None,
-    )
-
     mock: bool = Field(
         description="Whether to mock out Butler calls.",
         default=False,
diff --git a/tests/common/test_butler.py b/tests/common/test_butler.py
index 402a0e2c..2294d5ee 100644
--- a/tests/common/test_butler.py
+++ b/tests/common/test_butler.py
@@ -1,8 +1,9 @@
+import json
 from typing import Any
 
 import pytest
 
-from lsst.cmservice.common.butler import get_butler_config, parse_butler_repos_from_environment
+from lsst.cmservice.common.butler import get_butler_config
 from lsst.cmservice.config import config
 from lsst.daf.butler.registry import RegistryConfig
 
@@ -31,13 +32,12 @@ def mock_butler_environment(tmp_path: Any, monkeypatch: Any) -> None:
 """
     repo_mockgres_butler_yaml.write_text(repo_yaml)
 
-    monkeypatch.setenv("BUTLER__REPO__0__NAME", "/repo/mock")
-    monkeypatch.setenv("BUTLER__REPO__0__URI", f"{repo_mock_path}")
-    monkeypatch.setenv("BUTLER__REPO__1__NAME", "/repo/mockgres")
-    monkeypatch.setenv("BUTLER__REPO__1__URI", f"{repo_mockgres_butler_yaml}")
-    monkeypatch.setenv("BUTLER__REPO__2__NAME", "mockbargo")
-    monkeypatch.setenv("BUTLER__REPO__2__URI", "s3://bucket/prefix/object.yaml")
-    monkeypatch.setenv("BUTLER__REPO__3__NAME", "nosuchrepo")
+    daf_butler_repositories = {
+        "/repo/mock": f"{repo_mock_path}",
+        "/repo/mockgres": f"{repo_mockgres_butler_yaml}",
+        "mockbargo": "s3://bucket/prefix/object.yaml",
+    }
+    monkeypatch.setenv("DAF_BUTLER_REPOSITORIES", json.dumps(daf_butler_repositories))
 
 
 @pytest.fixture
@@ -52,11 +52,6 @@ def mock_db_auth_file(tmp_path: Any, monkeypatch: Any) -> None:
     monkeypatch.setattr(config.butler, "authentication_file", str(mock_auth_path))
 
 
-def test_parse_butler_config_from_environment(mock_butler_environment: Any) -> None:
-    repos = parse_butler_repos_from_environment()
-    assert len(repos.keys()) == 3
-
-
 @pytest.mark.asyncio
 async def test_butler_creation_without_db_auth_file(mock_butler_environment: Any) -> None:
     bc = await get_butler_config("/repo/mock", without_datastore=True)