diff --git a/src/where/index.ts b/src/where/index.ts
index 804b44f9..06b7d95f 100644
--- a/src/where/index.ts
+++ b/src/where/index.ts
@@ -10,7 +10,7 @@ export interface WhereQuery<_Model> {
 
 export type BasicWhereFilter = Exclude<
   FirestoreWhereFilterOp,
-  'array-contains' | 'in'
+  'array-contains' | 'in' | 'not-in'
 >
 
 // Basic filter variation
@@ -22,7 +22,7 @@ function where<Model, Key extends keyof Model>(
 // in variation
 function where<Model, Key extends keyof Model>(
   field: Key | [Key] | DocId,
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: string[]
 ): WhereQuery<Model>
 
@@ -46,7 +46,7 @@ function where<
 // in variation
 function where<Model, Key extends keyof Model>(
   field: Key | [Key],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key][]
 ): WhereQuery<Model>
 
@@ -71,7 +71,7 @@ function where<
 // in variation
 function where<Model, Key1 extends keyof Model, Key2 extends keyof Model[Key1]>(
   field: [Key1, Key2],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][]
 ): WhereQuery<Model>
 
@@ -107,7 +107,7 @@ function where<
   Key3 extends keyof Model[Key1][Key2]
 >(
   field: [Key1, Key2, Key3],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][]
 ): WhereQuery<Model>
 
@@ -146,7 +146,7 @@ function where<
   Key4 extends keyof Model[Key1][Key2][Key3]
 >(
   field: [Key1, Key2, Key3, Key4],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][Key4][]
 ): WhereQuery<Model>
 
@@ -188,7 +188,7 @@ function where<
   Key5 extends keyof Model[Key1][Key2][Key3][Key4]
 >(
   field: [Key1, Key2, Key3, Key4, Key5],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][Key4][Key5][]
 ): WhereQuery<Model>
 
@@ -233,7 +233,7 @@ function where<
   Key6 extends keyof Model[Key1][Key2][Key3][Key4][Key5]
 >(
   field: [Key1, Key2, Key3, Key4, Key5, Key6],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][Key4][Key5][Key6][]
 ): WhereQuery<Model>
 
@@ -281,7 +281,7 @@ function where<
   Key7 extends keyof Model[Key1][Key2][Key3][Key4][Key5][Key6]
 >(
   field: [Key1, Key2, Key3, Key4, Key5, Key6, Key7],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][Key4][Key5][Key6][Key7][]
 ): WhereQuery<Model>
 
@@ -332,7 +332,7 @@ function where<
   Key8 extends keyof Model[Key1][Key2][Key3][Key4][Key5][Key6][Key7]
 >(
   field: [Key1, Key2, Key3, Key4, Key5, Key6, Key7, Key8],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][Key4][Key5][Key6][Key7][Key8][]
 ): WhereQuery<Model>
 
@@ -386,7 +386,7 @@ function where<
   Key9 extends keyof Model[Key1][Key2][Key3][Key4][Key5][Key6][Key7][Key8]
 >(
   field: [Key1, Key2, Key3, Key4, Key5, Key6, Key7, Key8, Key9],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][Key4][Key5][Key6][Key7][Key8][Key9][]
 ): WhereQuery<Model>
 
@@ -443,7 +443,7 @@ function where<
   Key10 extends keyof Model[Key1][Key2][Key3][Key4][Key5][Key6][Key7][Key8][Key9]
 >(
   field: [Key1, Key2, Key3, Key4, Key5, Key6, Key7, Key8, Key9, Key10],
-  filter: 'in',
+  filter: 'in' | 'not-in',
   value: Model[Key1][Key2][Key3][Key4][Key5][Key6][Key7][Key8][Key9][Key10][]
 ): WhereQuery<Model>