diff --git a/docker-compose.yml b/docker-compose.yml
index 07befe8..9ffa781 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -7,6 +7,8 @@ services:
     # build: .
     # image: fascinated/sharex-php-uploader
     restart: always
+    environment:
+      - MAX_UPLOAD_SIZE=500M
     ports:
       - 80:80
     volumes:
diff --git a/docker/start.sh b/docker/start.sh
index 4e55b03..2434eff 100644
--- a/docker/start.sh
+++ b/docker/start.sh
@@ -11,6 +11,13 @@ echo "Starting PHP"
 service php8.1-fpm start
 chmod 777 /run/php/php8.1-fpm.sock # I don't know how to fix this properly, but it works.
 
+echo "Setting max upload size to ${MAX_UPLOAD_SIZE}"
+sed -i "s/^upload_max_filesize = .*/upload_max_filesize = ${MAX_UPLOAD_SIZE}/" /etc/php/8.1/fpm/php.ini
+sed -i "s/^post_max_size = .*/post_max_size = ${MAX_UPLOAD_SIZE}/" /etc/php/8.1/fpm/php.ini
+
+# Restart php to apply changes
+service php8.1-fpm restart
+
 # Start Nginx
 echo "Starting Nginx"
 nginx -g "daemon off;"
\ No newline at end of file