diff --git a/types/base.d.ts b/types/base.d.ts
index 1aaf772..6609e79 100644
--- a/types/base.d.ts
+++ b/types/base.d.ts
@@ -3,16 +3,16 @@ export class PlivoGenericResponse {
     id: string;
 }
 export class PlivoResource {
-    constructor(action: any, klass: any, idField: any, request: any);
+    constructor(action: string, klass: any, idField: string, request: any);
     update(params: object, id: string): Promise<any>;
     delete(params: object): Promise<any>;
-    executeAction(task: string, method: string, params: {}, action: any): Promise<any>;
+    executeAction(task: string, method: string, params: {}, action: string): Promise<any>;
     customexecuteAction(url: any, method?: string, params?: {}): Promise<any>;
     customexecuteGetNumberAction(url: any, method?: string, params?: {}): any;
     getMetaResponse(url: any, method?: string, params?: {}): Promise<any>;
 }
 export class PlivoResourceInterface {
-    constructor(action: any, klass: any, idField: any, request: any);
+    constructor(action: string, klass: any, idField: string, request: any);
     get(id: string, params?: {}): Promise<any>;
     list(params: object): Promise<any>;
     create(params: object): Promise<any>;
diff --git a/types/rest/request-test.d.ts b/types/rest/request-test.d.ts
index 028039c..1f56632 100644
--- a/types/rest/request-test.d.ts
+++ b/types/rest/request-test.d.ts
@@ -1 +1 @@
-export function Request(config: any): (method: any, action: any, params: object) => Promise<any>;
+export function Request(config: any): (method: string, action: string, params: object) => Promise<any>;
diff --git a/types/rest/request.d.ts b/types/rest/request.d.ts
index 028039c..1f56632 100644
--- a/types/rest/request.d.ts
+++ b/types/rest/request.d.ts
@@ -1 +1 @@
-export function Request(config: any): (method: any, action: any, params: object) => Promise<any>;
+export function Request(config: any): (method: string, action: string, params: object) => Promise<any>;
diff --git a/types/rest/utils.d.ts b/types/rest/utils.d.ts
index ac52936..13c7262 100644
--- a/types/rest/utils.d.ts
+++ b/types/rest/utils.d.ts
@@ -1,4 +1,4 @@
-export function camelCaseRequestWrapper(requestFunc: any): (method: any, action: any, params: object) => any;
+export function camelCaseRequestWrapper(requestFunc: any): (method: string, action: string, params: object) => any;
 export function validateSpeakAttributes(content: any, voice: any): {
     success: boolean;
     msg?: undefined;