diff --git a/types/sequelize/index.d.ts b/types/sequelize/index.d.ts
index b6d1da1e55..37a0b46829 100644
--- a/types/sequelize/index.d.ts
+++ b/types/sequelize/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for Sequelize 4.27.9
+// Type definitions for Sequelize 4.27.10
 // Project: http://sequelizejs.com
 // Definitions by: samuelneff <https://github.com/samuelneff>
 //                 Peter Harris <https://github.com/codeanimal>
@@ -4006,7 +4006,7 @@ declare namespace sequelize {
          * because SQLite always runs INSERT OR IGNORE + UPDATE, in a single query, so there is no way to know
          * whether the row was inserted or not.
          */
-        upsert(values: TAttributes, options?: UpsertOptions & { returning: false | undefined }): Promise<boolean>;
+        upsert(values: TAttributes, options?: UpsertOptions & { returning?: false | undefined }): Promise<boolean>;
         upsert(values: TAttributes, options?: UpsertOptions & { returning: true }): Promise<[TInstance, boolean]>;
         insertOrUpdate(values: TAttributes, options?: UpsertOptions & { returning: false | undefined }): Promise<boolean>;
         insertOrUpdate(values: TAttributes, options?: UpsertOptions & { returning: true }): Promise<[TInstance, boolean]>;
diff --git a/types/sequelize/sequelize-tests.ts b/types/sequelize/sequelize-tests.ts
index 1572b91c00..9c5eb13708 100644
--- a/types/sequelize/sequelize-tests.ts
+++ b/types/sequelize/sequelize-tests.ts
@@ -1055,6 +1055,7 @@ findOrRetVal = User.findOrCreate( { where : { email : 'unique.email.@d.com', com
 findOrRetVal = User.findOrCreate( { where : { objectId : 1 }, defaults : { bool : false } } );
 
 let upsertPromiseNoOptions: Bluebird<boolean> = User.upsert( { id : 42, username : 'doe', foo : s.fn( 'upper', 'mixedCase2' ) } );
+let upsertPromiseWithNonReturningOptions: Bluebird<boolean> = User.upsert( { id : 42, username : 'doe', foo : s.fn( 'upper', 'mixedCase2' ) }, { logging: true } );
 let upsertPromiseReturning: Bluebird<[AnyInstance, boolean]> = User.upsert( { id : 42, username : 'doe', foo : s.fn( 'upper', 'mixedCase2' ) }, { returning: true } );
 let upsertPromiseNotReturning: Bluebird<boolean> = User.upsert( { id : 42, username : 'doe', foo : s.fn( 'upper', 'mixedCase2' ) }, { returning: false } );