diff --git a/.docker/mysql/init/01-databases.sql b/.docker/mysql/init/01-databases.sql
index 7817ec31..a00308e3 100644
--- a/.docker/mysql/init/01-databases.sql
+++ b/.docker/mysql/init/01-databases.sql
@@ -1,7 +1,8 @@
--- Create databases.
 CREATE DATABASE IF NOT EXISTS `redmine_development`;
-CREATE DATABASE IF NOT EXISTS `redmine_test`;
-
--- Grant permissions.
 GRANT ALL PRIVILEGES ON redmine_development.* TO 'redmine';
+
+CREATE DATABASE IF NOT EXISTS `redmine_test`;
 GRANT ALL PRIVILEGES ON redmine_test.* TO 'redmine';
+
+CREATE DATABASE IF NOT EXISTS `redmine_production`;
+GRANT ALL PRIVILEGES ON redmine_production.* TO 'redmine';
diff --git a/.docker/redmine/Dockerfile b/.docker/redmine/Dockerfile
index 1351b441..2ac9321b 100644
--- a/.docker/redmine/Dockerfile
+++ b/.docker/redmine/Dockerfile
@@ -1,8 +1,14 @@
-FROM redmine:4.2
+FROM redmine:5.1
 
 ENV LANG=en_us
 
 RUN apt update -qq > /dev/null \
-  && apt install -qqy build-essential make vim less > /dev/null
+  && apt install -qqy build-essential make vim less libxslt-dev libxml2-dev > /dev/null \
+  && ln -s /usr/include/libxml2/libxml /usr/include/libxml \
+  && chmod o+t -R /tmp
+
+# Force the "development" environment.
+# See docker-compose.yml for documentation.
+ENV RAILS_ENV=development
 
 CMD ["rails", "server", "-b", "0.0.0.0"]
diff --git a/.docker/redmine/additional_environment.rb b/.docker/redmine/additional_environment.rb
deleted file mode 100644
index e69de29b..00000000
diff --git a/.docker/redmine/database.yml b/.docker/redmine/database.yml
index 6381cdcb..9b69f8ce 100644
--- a/.docker/redmine/database.yml
+++ b/.docker/redmine/database.yml
@@ -13,3 +13,7 @@ development:
 test:
   <<: *default
   database: redmine_test
+
+production:
+  <<: *default
+  database: redmine_production
diff --git a/Rakefile b/Rakefile
index 9c3132e7..6de85a37 100644
--- a/Rakefile
+++ b/Rakefile
@@ -55,7 +55,7 @@ task :provision do
   puts 'Installing dev packages...'
   sleep(2)
   sh 'docker compose exec redmine bundle lock --add-platform x86-mingw32 x64-mingw32 x86-mswin32'
-  sh 'docker compose exec redmine bundle config set with "default dev test"'
+  sh 'docker compose exec redmine bundle config --delete without'
   sh 'docker compose exec redmine bundle install'
 
   puts 'Preparing database...'
diff --git a/docker-compose.yml b/docker-compose.yml
index 892b096c..c641332e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -11,7 +11,12 @@ services:
       - mysql
       - mailhog
     environment:
-      RAILS_ENV: development
+      # Unfortunately, using RAILS_ENV in the docker-compose.yml file causes
+      # an error. Thus, as per community suggestions, we set the environment
+      # to "production" and then change it to "development" in the Dockerfile.
+      #
+      # See https://github.com/docker-library/redmine/issues/298
+      RAILS_ENV: production
       REDMINE_LANG: en
       REDMINE_DB_MYSQL: mysql
       REDMINE_DB_ENCODING: utf8
@@ -23,7 +28,6 @@ services:
       - ./.docker/redmine/seeds.rb:/usr/src/redmine/db/seeds.rb
       - ./.docker/redmine/configuration.yml:/usr/src/redmine/config/configuration.yml
       - ./.docker/redmine/database.yml:/usr/src/redmine/config/database.yml
-      - ./.docker/redmine/additional_environment.rb:/usr/src/redmine/config/additional_environment.rb
   mysql:
     image: mariadb:10.6
     container_name: t2r-5x-mysql