diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 1a88a9d..8fa536a 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -31,6 +31,7 @@ jobs:
           cache-dependency-path: "package-lock.json"
 
       - name: Deploy
+        working-directory: ./infrastructure
         run: |
           npm ci
           npx cdk deploy --require-approval never -O output.js
diff --git a/.github/workflows/post-cdk-diff.yml b/.github/workflows/post-cdk-diff.yml
index b610526..0d2114f 100644
--- a/.github/workflows/post-cdk-diff.yml
+++ b/.github/workflows/post-cdk-diff.yml
@@ -27,6 +27,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Run `cdk diff`
+        working-directory: ./infrastructure
         run: |
           npm install
           echo '# cdk diffの結果' > cdk-diff-result.txt
@@ -34,6 +35,7 @@ jobs:
 
       - name: Post a comment
         uses: actions/github-script@v7.0.1
+        working-directory: ./infrastructure
         with:
           script: |
             const fs = require('fs')