diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b6d2f28..9006575 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,10 +9,14 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   go:
     name: Go (vet + test)
-    runs-on: macos-latest
+    runs-on: self-hosted
 
     steps:
       - uses: actions/checkout@v4
@@ -22,10 +26,13 @@ jobs:
         with:
           go-version: "1.23"
 
-      - name: Set up Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: "22"
+      - name: Setup Node
+        env:
+          NVM_DIR: /Users/samuelbailey/.nvm
+        run: |
+          . "$NVM_DIR/nvm.sh"
+          nvm use 20
+          echo "$NVM_DIR/versions/node/$(nvm version)/bin" >> $GITHUB_PATH
 
       - name: Build frontend assets
         working-directory: frontend
@@ -39,7 +46,9 @@ jobs:
 
   frontend:
     name: Frontend (build + test)
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
+    env:
+      NVM_DIR: /Users/samuelbailey/.nvm
     defaults:
       run:
         working-directory: frontend
@@ -47,10 +56,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: "22"
+      - name: Setup Node
+        run: |
+          . "$NVM_DIR/nvm.sh"
+          nvm use 20
+          echo "$NVM_DIR/versions/node/$(nvm version)/bin" >> $GITHUB_PATH
 
       - name: Install dependencies
         run: npm ci