diff --git a/docker-compose-mariadb.yml b/docker-compose-mariadb.yml
index 9309b2da..a425d148 100644
--- a/docker-compose-mariadb.yml
+++ b/docker-compose-mariadb.yml
@@ -10,6 +10,8 @@ services:
       - MARIADB_RANDOM_ROOT_PASSWORD=1
     volumes:
       - /srv/docker/redmine/mariadb:/var/lib/mysql
+    # https://www.redmine.org/projects/redmine/wiki/MySQL_configuration
+    command: mysqld --transaction-isolation=READ-COMMITTED
 
   redmine:
     build: ./
diff --git a/docker-compose-mysql.yml b/docker-compose-mysql.yml
index 1860d483..eadddb51 100644
--- a/docker-compose-mysql.yml
+++ b/docker-compose-mysql.yml
@@ -9,6 +9,8 @@ services:
       - DB_NAME=redmine_production
     volumes:
       - /srv/docker/redmine/mysql:/var/lib/mysql
+    # https://www.redmine.org/projects/redmine/wiki/MySQL_configuration
+    command: --transaction-isolation=READ-COMMITTED
 
   redmine:
     build: ./