diff --git a/.github/workflows/production.yaml b/.github/workflows/production.yaml
index 56471814..40db9f30 100644
--- a/.github/workflows/production.yaml
+++ b/.github/workflows/production.yaml
@@ -44,7 +44,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-yarn-
       - name: Install dependencies
-        run: yarn install
+        run: yarn install --immutable
       - name: Build and Test
         env:
           REACT_APP_FIREBASE_API_KEY: ${{ secrets.REACT_APP_FIREBASE_API_KEY }}
diff --git a/.github/workflows/pullrequest.yaml b/.github/workflows/pullrequest.yaml
index 9b146f20..6ddffc4f 100644
--- a/.github/workflows/pullrequest.yaml
+++ b/.github/workflows/pullrequest.yaml
@@ -32,7 +32,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-yarn-
       - name: Install dependencies
-        run: yarn install
+        run: yarn install --immutable
       - name: Build and Test
         env:
           REACT_APP_FIREBASE_API_KEY: ${{ secrets.REACT_APP_FIREBASE_API_KEY }}