diff --git a/compose-files/docker-compose.yml b/compose-files/docker-compose.yml
index 3624290..5622bd2 100644
--- a/compose-files/docker-compose.yml
+++ b/compose-files/docker-compose.yml
@@ -21,7 +21,7 @@ services:
   ### Schul-Cloud Server
   ###
   mongodb:
-    image: mongo:5.0.26 ## change tag in version.env
+    image: mongo:4.2.9 ## change tag in version.env
     container_name: mongodb-primary
     ports:
       - "27017:27017"
@@ -34,7 +34,7 @@ services:
     command: --bind_ip_all --replSet rs0 --enableMajorityReadConcern false
 
   mongodb-secondary:
-    image: mongo:5.0.26 ## change tag in version.env
+    image: mongo:4.2.9 ## change tag in version.env
     container_name: mongodb-secondary
     ports:
       - "27017"
@@ -45,7 +45,7 @@ services:
     command: --bind_ip_all --replSet rs0 --enableMajorityReadConcern false
 
   mongodb-arbiter:
-    image: mongo:5.0.26 ## change tag in version.env
+    image: mongo:4.2.9 ## change tag in version.env
     container_name: mongodb-arbiter
     ports:
       - "27017"
@@ -56,7 +56,7 @@ services:
     command: --bind_ip_all --replSet rs0 --enableMajorityReadConcern false
 
   mongosetup:
-    image: mongo:5.0.26
+    image: mongo:4.2.9
     depends_on:
       - mongodb
       - mongodb-secondary
diff --git a/envs/default.env b/envs/default.env
index 8ae38a8..6008389 100644
--- a/envs/default.env
+++ b/envs/default.env
@@ -4,5 +4,5 @@
 COMPOSE_FILES_PATH=./compose-files
 POSTGRES_DOCKER_TAG=11.9
 REDIS_DOCKER_TAG=6.0.8
-MONGO_DOCKER_TAG=5.0.26
+MONGO_DOCKER_TAG=4.2.9
 RABBITMQ_DOCKER_TAG=3.8.9-management