diff --git a/src/test/java/io/codeka/gaia/test/MongoContainer.java b/src/test/java/io/codeka/gaia/test/MongoContainer.java
index 4c0fffc29..5de5b5bab 100644
--- a/src/test/java/io/codeka/gaia/test/MongoContainer.java
+++ b/src/test/java/io/codeka/gaia/test/MongoContainer.java
@@ -27,7 +27,7 @@ public class MongoContainer extends GenericContainer {
     private MongoDatabase database;
 
     public MongoContainer() {
-        super("mongo");
+        super("mongo:4.0");
         setExposedPorts(List.of(MONGO_PORT));
     }