diff --git a/Dockerfile b/Dockerfile
index 6f4407ff..cfa6b133 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -34,19 +34,24 @@ FROM php:8.2-fpm-alpine AS runtime
 # System deps + PHP extensions.
 #   pdo_mysql -> MariaDB,  intl -> Symfony,  opcache -> perf,  redis -> Messenger/cache transport
 #
-# 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.
+# IMPORTANT: the Coolify build host cannot reach pecl.php.net (the redis package
+# registry) — both `pecl install redis` and install-php-extensions failed there
+# with `No releases available for package "pecl.php.net/redis"`. So redis is
+# built directly from its GitHub source tarball instead (github.com IS
+# reachable). pdo_mysql/intl/opcache are bundled with PHP and need no network.
+# retry() guards the apk/github fetches against transient mirror drops.
+ENV PHPREDIS_VERSION=6.1.0
 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 \
- && 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
+    retry apk add --no-cache nginx supervisor icu-libs \
+ && retry apk add --no-cache --virtual .build-deps $PHPIZE_DEPS icu-dev \
+ && docker-php-ext-install pdo_mysql intl opcache \
+ && retry curl -sSLf "https://github.com/phpredis/phpredis/archive/refs/tags/${PHPREDIS_VERSION}.tar.gz" -o /tmp/phpredis.tar.gz \
+ && mkdir -p /usr/src/php/ext/redis \
+ && tar -xf /tmp/phpredis.tar.gz -C /usr/src/php/ext/redis --strip-components=1 \
+ && docker-php-ext-install redis \
+ && rm -rf /tmp/phpredis.tar.gz \
+ && apk del .build-deps
 
 WORKDIR /app