diff --git a/libs/angular-i18next/src/lib/I18NextService.ts b/libs/angular-i18next/src/lib/I18NextService.ts
index cef47c0..160251c 100644
--- a/libs/angular-i18next/src/lib/I18NextService.ts
+++ b/libs/angular-i18next/src/lib/I18NextService.ts
@@ -56,9 +56,9 @@ export class I18NextService implements ITranslationService {
     this.i18next = i18nextInstance ?? i18nextGlobal;
   }
 
-  t(key: string | string[], options?: ITranslationOptions | undefined): i18n.DefaultTReturn<ITranslationOptions>;
-  t(key: string | string[] | (string | TemplateStringsArray)[], defaultValue: string, options?: ITranslationOptions | undefined): i18n.DefaultTReturn<ITranslationOptions>;
-  t(key: unknown, defaultValueOrOptions?: unknown, options?: unknown): i18n.DefaultTReturn<ITranslationOptions> {
+  t(key: string | string[], options?: ITranslationOptions | undefined): i18n.TFunctionReturn<i18n.Namespace, string | string[], ITranslationOptions>;
+  t(key: string | string[] | (string | TemplateStringsArray)[], defaultValue: string, options?: ITranslationOptions | undefined): i18n.TFunctionReturn<i18n.Namespace, string | string[], ITranslationOptions>;
+  t(key: unknown, defaultValueOrOptions?: unknown, options?: unknown): i18n.TFunctionReturn<i18n.Namespace, unknown, ITranslationOptions> {
     const hasDefault = !!defaultValueOrOptions && typeof defaultValueOrOptions === 'string';
 
     this.i18next.t.bind(this.i18next);
diff --git a/libs/angular-i18next/src/lib/ITranslationService.ts b/libs/angular-i18next/src/lib/ITranslationService.ts
index f30cda9..ec70ef5 100644
--- a/libs/angular-i18next/src/lib/ITranslationService.ts
+++ b/libs/angular-i18next/src/lib/ITranslationService.ts
@@ -5,7 +5,7 @@ import { $Dictionary as I18Next$Dictionary } from 'i18next/typescript/helpers';
 
 type Modify<T, R> = Omit<T, keyof R> & R;
 
-export type ITranslationOptions = i18n.TOptions & I18Next$Dictionary & { defaultValue?: string; };
+export type ITranslationOptions = i18n.TOptions<I18Next$Dictionary>  & { defaultValue?: string; };
 
 export type ITranslationService = Modify<Partial<i18n.i18n>, {
 
@@ -29,12 +29,12 @@ export type ITranslationService = Modify<Partial<i18n.i18n>, {
   t(
     key: string | string[],
     options?: ITranslationOptions,
-  ): i18n.DefaultTReturn<ITranslationOptions>;
+  ): i18n.TFunctionReturn<i18n.Namespace, string | string[], ITranslationOptions>;
   t(
     key: string | string[],
     defaultValue: string,
     options?: ITranslationOptions
-  ): i18n.DefaultTReturn<ITranslationOptions>;
+  ): i18n.TFunctionReturn<i18n.Namespace, string | string[], ITranslationOptions>;
 
   format: i18n.FormatFunction;
 
diff --git a/libs/angular-i18next/src/lib/models.ts b/libs/angular-i18next/src/lib/models.ts
index bd5ff2e..6ed8c9c 100644
--- a/libs/angular-i18next/src/lib/models.ts
+++ b/libs/angular-i18next/src/lib/models.ts
@@ -6,6 +6,6 @@ export type PrependPipeOptions = {
   prependScope?: boolean;
   prependNamespace?: boolean;
 };
-export type PipeOptions = i18n.TOptionsBase & I18Next$Dictionary & { defaultValue?: string; } &
+export type PipeOptions = i18n.TOptions<I18Next$Dictionary> & { defaultValue?: string; } &
   FormatPipeOptions &
   PrependPipeOptions;
diff --git a/libs/angular-i18next/src/tests/mocks/MockTranslationService.ts b/libs/angular-i18next/src/tests/mocks/MockTranslationService.ts
index e96b5e1..051b3d6 100644
--- a/libs/angular-i18next/src/tests/mocks/MockTranslationService.ts
+++ b/libs/angular-i18next/src/tests/mocks/MockTranslationService.ts
@@ -35,7 +35,7 @@ export class MockI18NextService implements ITranslationService {
 
   t = jest.fn((key: string | string[],
     optionsOrDefault?: string | i18next.TOptions,
-    options?: i18next.TOptions): i18next.DefaultTReturn<(i18next.TOptions & { defaultValue: string; })> => {
+    options?: i18next.TOptions): i18next.TFunctionReturn<i18next.Namespace, string | string[], (i18next.TOptions & { defaultValue: string; })> => {
     if (key instanceof Array) {
       return key.length > 0 ? key[0] : '';
     }