diff --git a/docker-dev/docker-compose.yml b/docker-dev/docker-compose.yml
index 5e17105c3c2f027fcb6ed5da005da606ad8bdb57..a89535fbd1b2f7905b5fa4bf7aa66b6196e3c86b 100644
--- a/docker-dev/docker-compose.yml
+++ b/docker-dev/docker-compose.yml
@@ -18,8 +18,8 @@ services:
     working_dir: /application
     volumes:
       - ..:/application
-      - ./php-fpm/php-ini-overrides.ini:/etc/php/7.3/fpm/conf.d/99-overrides.ini
-      - ./php-fpm/php-fpm-overrides.conf:/etc/php/7.3/fpm/pool.d/z-overrides.conf
+      - ./php-fpm/php-ini-overrides.ini:/etc/php/7.4/fpm/conf.d/99-overrides.ini
+      - ./php-fpm/php-fpm-overrides.conf:/etc/php/7.4/fpm/pool.d/z-overrides.conf
 
   queue-worker:
     environment:
@@ -31,7 +31,7 @@ services:
     volumes:
       - ./php-fpm/queue-worker.conf:/etc/supervisor/conf.d/queue-worker.conf
       - ..:/application
-      - ./php-fpm/php-ini-overrides.ini:/etc/php/7.3/cli/conf.d/99-overrides.ini
+      - ./php-fpm/php-ini-overrides.ini:/etc/php/7.4/cli/conf.d/99-overrides.ini
 
   redis:
     image: "redis"
diff --git a/docker-dev/php-fpm/Dockerfile b/docker-dev/php-fpm/Dockerfile
index 4891515845efb769afffde812330c406b8d5c20f..1a846aa1bcfc643ea81ed83301310d3e64928a54 100644
--- a/docker-dev/php-fpm/Dockerfile
+++ b/docker-dev/php-fpm/Dockerfile
@@ -1,15 +1,9 @@
-FROM debian:buster
+FROM debian:bullseye
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Basics
-RUN apt-get update && apt-get install -y wget lsb-release
-
 # Install PHP and the rest
-# Debian Buster only has php-redis 4.2, we need 4.3
-RUN wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg \
-    && echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list \
-    && apt-get update \
+RUN apt-get update \
     && apt-get -y --no-install-recommends install \
         ca-certificates \
         curl \
@@ -18,23 +12,23 @@ RUN wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
         git \
         php-apcu \
         php-apcu-bc \
-        php7.3-cli \
-        php7.3-curl \
-        php7.3-gd \
-        php7.3-soap \
-        php7.3-json \
-        php7.3-mbstring \
-        php7.3-mysql \
-        php7.3-opcache \
-        php7.3-readline \
-        php7.3-xml \
-        php7.3-intl \
-        php7.3-zip \
-        php7.3-redis \
-        php7.3-fpm \
-        php7.3-ldap \
-        php7.3-gmp \
-        php7.3-xdebug \
+        php7.4-cli \
+        php7.4-curl \
+        php7.4-gd \
+        php7.4-soap \
+        php7.4-json \
+        php7.4-mbstring \
+        php7.4-mysql \
+        php7.4-opcache \
+        php7.4-readline \
+        php7.4-xml \
+        php7.4-intl \
+        php7.4-zip \
+        php7.4-redis \
+        php7.4-fpm \
+        php7.4-ldap \
+        php7.4-gmp \
+        php7.4-xdebug \
         composer \
         supervisor \
     && apt-get clean \
@@ -48,12 +42,11 @@ RUN echo 'user ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
 
 # Install a newer composer
 RUN mkdir -p /home/user/.local/bin
-RUN wget https://raw.githubusercontent.com/composer/getcomposer.org/bfd95e2a4383ee9cf7c058c2df29d7acb5f86d77/web/installer  -O - -q | php --
-RUN mv composer.phar /home/user/.local/bin/composer
+RUN curl -L https://github.com/composer/getcomposer.org/raw/main/web/download/2.2.5/composer.phar -o /home/user/.local/bin/composer
 ENV PATH "/home/user/.local/bin:${PATH}"
 
 USER user
 
-CMD ["/usr/sbin/php-fpm7.3", "-O" ]
+CMD ["/usr/sbin/php-fpm7.4", "-O" ]
 EXPOSE 9000
 WORKDIR "/application"