diff --git a/changelog/items/other/mongo-replicaset-env.md b/changelog/items/other/mongo-replicaset-env.md
new file mode 100644
index 00000000..0dcbb402
--- /dev/null
+++ b/changelog/items/other/mongo-replicaset-env.md
@@ -0,0 +1,2 @@
+- Parameterize MongoDB replicaset in `docker-compose.mongodb.yml` via
+  `SKYNET_DB_REPLICASET` from `.env` file.
\ No newline at end of file
diff --git a/docker-compose.mongodb.yml b/docker-compose.mongodb.yml
index ebc085ab..41b07a86 100644
--- a/docker-compose.mongodb.yml
+++ b/docker-compose.mongodb.yml
@@ -9,7 +9,7 @@ x-logging: &default-logging
 services:
   mongo:
     image: mongo:4.4.1
-    command: --keyFile=/data/mgkey --replSet=skynet
+    command: --keyFile=/data/mgkey --replSet=${SKYNET_DB_REPLICASET:-skynet}
     container_name: mongo
     restart: unless-stopped
     logging: *default-logging