diff --git a/beanie/odm/utils/encoder.py b/beanie/odm/utils/encoder.py
index be7dc096..2316431d 100644
--- a/beanie/odm/utils/encoder.py
+++ b/beanie/odm/utils/encoder.py
@@ -58,6 +58,8 @@
     bson.Binary,
     bson.DBRef,
     bson.Decimal128,
+    bson.MaxKey,
+    bson.MinKey,
     bson.ObjectId,
 )