diff --git a/types/document.d.ts b/types/document.d.ts
index 2bb82e3c67..c0723e883b 100644
--- a/types/document.d.ts
+++ b/types/document.d.ts
@@ -16,7 +16,7 @@ declare module 'mongoose' {
    * *  TQueryHelpers - Object with any helpers that should be mixed into the Query type
    * *  DocType - the type of the actual Document created
    */
-  class Document<T = any, TQueryHelpers = any, DocType = any> {
+  class Document<T = unknown, TQueryHelpers = any, DocType = any> {
     constructor(doc?: any);
 
     /** This documents _id. */
diff --git a/types/types.d.ts b/types/types.d.ts
index f63b193490..08f90c6184 100644
--- a/types/types.d.ts
+++ b/types/types.d.ts
@@ -83,7 +83,7 @@ declare module 'mongoose' {
     class ObjectId extends mongodb.ObjectId {
     }
 
-    class Subdocument<IdType = any, TQueryHelpers = any, DocType = any> extends Document<IdType, TQueryHelpers, DocType> {
+    class Subdocument<IdType = unknown, TQueryHelpers = any, DocType = any> extends Document<IdType, TQueryHelpers, DocType> {
       $isSingleNested: true;
 
       /** Returns the top level document of this sub-document. */