diff --git a/.gitea/workflows/image-update-and-release.yaml b/.gitea/workflows/image-update-and-release.yaml
index aae24a6..1c5563b 100644
--- a/.gitea/workflows/image-update-and-release.yaml
+++ b/.gitea/workflows/image-update-and-release.yaml
@@ -179,11 +179,11 @@ jobs:
           echo "  WordPress: $WP_BASE ($WP_LATEST)"
           echo "  Nginx: $NGINX_LATEST"
 
-          # WordPressのtagを更新
-          sed -i "/^  wordpress:/,/^  [a-z]/s|tag: \"[^\"]*\"|tag: \"$WP_LATEST\"|" values.yaml
+          # WordPressのtagを更新（より単純で確実な方法）
+          sed -i "s|tag: \"[0-9.]*-php[0-9.]*-fpm-alpine\"|tag: \"$WP_LATEST\"|" values.yaml
 
-          # Nginxのtagを更新
-          sed -i "/^  nginx:/,/^  [a-z]/s|tag: \"[^\"]*\"|tag: \"$NGINX_LATEST\"|" values.yaml
+          # Nginxのtagを更新（より単純で確実な方法）
+          sed -i "s|tag: \"[0-9.]*-alpine-perl\"|tag: \"$NGINX_LATEST\"|" values.yaml
 
           # 変更内容を表示
           echo ""