diff --git a/Dockerfile b/Dockerfile
index 6b110232..6f4407ff 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,17 +33,20 @@ FROM php:8.2-fpm-alpine AS runtime
 
 # System deps + PHP extensions.
 #   pdo_mysql -> MariaDB,  intl -> Symfony,  opcache -> perf,  redis -> Messenger/cache transport
-# apk/pecl fetch over the network; on busy build hosts the mirror occasionally
-# drops a connection. retry() wraps each network step so a transient failure
-# doesn't abort the whole deploy.
+#
+# Extensions are installed via mlocati/install-php-extensions, which fetches
+# PREBUILT binaries instead of compiling from source. The previous approach
+# (pecl install redis + docker-php-ext-install) compiled redis/intl/pdo_mysql
+# on every build — minutes of CPU that intermittently overran Coolify's build
+# timeout (exit 255). The prebuilt path is seconds and needs no .build-deps.
 RUN set -eu; \
     retry() { for i in 1 2 3 4 5; do "$@" && return 0; echo "retry $i: $*"; sleep 5; done; return 1; }; \
-    retry apk add --no-cache nginx supervisor icu-libs \
- && retry apk add --no-cache --virtual .build-deps $PHPIZE_DEPS icu-dev \
- && docker-php-ext-install pdo_mysql intl opcache \
- && retry pecl install redis \
- && docker-php-ext-enable redis \
- && apk del .build-deps
+    retry apk add --no-cache nginx supervisor \
+ && retry curl -sSLf https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions \
+        -o /usr/local/bin/install-php-extensions \
+ && chmod +x /usr/local/bin/install-php-extensions \
+ && install-php-extensions pdo_mysql intl opcache redis \
+ && rm -f /usr/local/bin/install-php-extensions
 
 WORKDIR /app