diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 2c5fe99..c4b0cb9 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -39,7 +39,7 @@ env:
 jobs:
   typecheck:
     name: TypeScript typecheck
-    runs-on: ubuntu-latest
+    runs-on: py3.12-node22
     steps:
       - uses: actions/checkout@v6
 
@@ -59,7 +59,7 @@ jobs:
 
   lint:
     name: Python lint
-    runs-on: ubuntu-latest
+    runs-on: py3.12-node22
     steps:
       - uses: actions/checkout@v6
 
@@ -71,7 +71,7 @@ jobs:
 
   test:
     name: Python tests
-    runs-on: ubuntu-latest
+    runs-on: py3.12-node22
     steps:
       - uses: actions/checkout@v6
 
@@ -100,7 +100,7 @@ jobs:
     needs: [typecheck, lint, test]
     # Only build on branch/tag pushes — not on pull requests
     if: github.event_name == 'push'
-    runs-on: ubuntu-latest
+    runs-on: py3.12-node22
     steps:
       - uses: actions/checkout@v6
 
diff --git a/infra/act-runner-config.yml b/infra/act-runner-config.yml
index 59636ed..b35b31c 100644
--- a/infra/act-runner-config.yml
+++ b/infra/act-runner-config.yml
@@ -11,7 +11,7 @@ runner:
   # Maps runs-on labels to Docker images for job containers.
   # Change this (and delete /data/.runner) to switch the base image.
   labels:
-    - "ubuntu-latest:docker://git.fabledsword.com/bvandeusen/runner-base:py3.12-node22"
+    - "py3.12-node22:docker://git.fabledsword.com/bvandeusen/runner-base:py3.12-node22"
 
 cache:
   enabled: true
diff --git a/infra/runner-compose.yml b/infra/runner-compose.yml
index 1554ec1..d953288 100644
--- a/infra/runner-compose.yml
+++ b/infra/runner-compose.yml
@@ -13,7 +13,7 @@ services:
       - GITEA_RUNNER_REGISTRATION_TOKEN=${RUNNER_TOKEN}
       - GITEA_RUNNER_NAME=swarm-runner
       # Maps the runs-on: ubuntu-latest label used in workflow files to a Docker image.
-      - GITEA_RUNNER_LABELS=ubuntu-latest:docker://git.fabledsword.com/bvandeusen/runner-base:py3.12-node22
+      - GITEA_RUNNER_LABELS=py3.12-node22:docker://git.fabledsword.com/bvandeusen/runner-base:py3.12-node22
       - CONFIG_FILE=/config/config.yml
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock