diff --git a/.gitea/workflows/update-images.yaml b/.gitea/workflows/update-images.yaml
index e2c80e1..612dd80 100644
--- a/.gitea/workflows/update-images.yaml
+++ b/.gitea/workflows/update-images.yaml
@@ -118,32 +118,44 @@ jobs:
           PACKAGE_FILE="${CHART_NAME}-${WP_VERSION}.tgz"
           
           # リリースノートの生成
-          RELEASE_NOTES="## WordPress Helm Chart v${WP_VERSION}
-
-### Updated Components
-
-| Component | Previous | Current |
-|-----------|----------|---------|
-| Nginx | \`${{ steps.nginx.outputs.current }}\` | \`${{ steps.nginx.outputs.latest }}\` |
-| WordPress | \`${{ steps.wordpress.outputs.current }}\` | \`${{ steps.wordpress.outputs.latest }}\` |
-
-### Installation
-
-\`\`\`bash
-helm repo add myrepo https://gitea.example.com/user/repo/raw/branch/gh-pages
-helm repo update
-helm install wordpress myrepo/${CHART_NAME} --version ${WP_VERSION}
-\`\`\`
-
-### Upgrade
-
-\`\`\`bash
-helm upgrade wordpress myrepo/${CHART_NAME} --version ${WP_VERSION}
-\`\`\`
-
----
-*This release was automatically generated*"
-
+          cat > release_notes.md << 'NOTES'
+          ## WordPress Helm Chart v$WP_VERSION
+          
+          ### Updated Components
+          
+          | Component | Previous | Current |
+          |-----------|----------|---------|
+          | Nginx | `$NGINX_OLD` | `$NGINX_NEW` |
+          | WordPress | `$WP_OLD` | `$WP_NEW` |
+          
+          ### Installation
+          
+          ```bash
+          helm repo add myrepo https://gitea.example.com/user/repo/raw/branch/gh-pages
+          helm repo update
+          helm install wordpress myrepo/$CHART_NAME --version $WP_VERSION
+          ```
+          
+          ### Upgrade
+          
+          ```bash
+          helm upgrade wordpress myrepo/$CHART_NAME --version $WP_VERSION
+          ```
+          
+          ---
+          *This release was automatically generated*
+          NOTES
+          
+          # 変数を置換
+          sed -i "s/\$WP_VERSION/${WP_VERSION}/g" release_notes.md
+          sed -i "s/\$CHART_NAME/${CHART_NAME}/g" release_notes.md
+          sed -i "s/\$NGINX_OLD/${{ steps.nginx.outputs.current }}/g" release_notes.md
+          sed -i "s/\$NGINX_NEW/${{ steps.nginx.outputs.latest }}/g" release_notes.md
+          sed -i "s/\$WP_OLD/${{ steps.wordpress.outputs.current }}/g" release_notes.md
+          sed -i "s/\$WP_NEW/${{ steps.wordpress.outputs.latest }}/g" release_notes.md
+          
+          RELEASE_BODY=$(cat release_notes.md | jq -Rs .)
+          
           # Gitea APIでリリース作成
           curl -X POST \
             -H "Authorization: token ${GITEA_TOKEN}" \
@@ -151,7 +163,7 @@ helm upgrade wordpress myrepo/${CHART_NAME} --version ${WP_VERSION}
             -d "{
               \"tag_name\": \"v${WP_VERSION}\",
               \"name\": \"WordPress Helm Chart v${WP_VERSION}\",
-              \"body\": $(echo "$RELEASE_NOTES" | jq -Rs .),
+              \"body\": ${RELEASE_BODY},
               \"draft\": false,
               \"prerelease\": false
             }" \
@@ -167,7 +179,7 @@ helm upgrade wordpress myrepo/${CHART_NAME} --version ${WP_VERSION}
           curl -X POST \
             -H "Authorization: token ${GITEA_TOKEN}" \
             -H "Content-Type: application/gzip" \
-            --data-binary @"${PACKAGE_FILE}" \
+            --data-binary "@${PACKAGE_FILE}" \
             "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=${PACKAGE_FILE}"
           
           echo "Gitea release v${WP_VERSION} created with chart package"