diff --git a/Dockerfile b/Dockerfile
index b740583..c841b03 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -80,8 +80,13 @@ COPY docker/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 COPY docker/php/entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
-# Pass container env vars through to PHP-FPM workers (needed for settings.php overrides).
-RUN echo 'clear_env = no' >> /usr/local/etc/php-fpm.d/zz-env.conf
+# Pass container env vars through to PHP-FPM workers; capture worker stderr so errors appear in container logs.
+RUN { \
+      echo 'clear_env = no'; \
+      echo 'catch_workers_output = yes'; \
+      echo 'php_admin_flag[log_errors] = on'; \
+      echo 'php_admin_value[error_log] = /dev/stderr'; \
+    } >> /usr/local/etc/php-fpm.d/zz-env.conf
 
 RUN chown -R www-data:www-data web/sites/default/files && \
     chmod -R 755 web/sites/default/files && \