diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 01ef304..d92c356 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v2
@@ -17,7 +17,7 @@ jobs:
       run: sudo apt install yarn
       
     - name: Install palava-web
-      run: yarn
+      run: yarn install --frozen-lockfile
 
     - name: Lint palava-web
       run: yarn lint