diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..1c2c22e
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1 @@
+FROM mongo:3.6.15
diff --git a/config b/config
index 9b27655..4bcf422 100644
--- a/config
+++ b/config
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
-export MONGO_IMAGE=${MONGO_IMAGE:="mongo"}
-export MONGO_IMAGE_VERSION=${MONGO_IMAGE_VERSION:="3.6.15"}
+export MONGO_IMAGE=${MONGO_IMAGE:="$(awk -F '[ :]' '{print $2}' Dockerfile)"}
+export MONGO_IMAGE_VERSION=${MONGO_IMAGE_VERSION:="$(awk -F '[ :]' '{print $3}' Dockerfile)"}
 export MONGO_ROOT=${MONGO_ROOT:="$DOKKU_LIB_ROOT/services/mongo"}
 export MONGO_HOST_ROOT=${MONGO_HOST_ROOT:=$MONGO_ROOT}