diff --git a/theHarvester/discovery/virustotal.py b/theHarvester/discovery/virustotal.py
index dcc02df2..c4a7c009 100644
--- a/theHarvester/discovery/virustotal.py
+++ b/theHarvester/discovery/virustotal.py
@@ -1,6 +1,5 @@
-from theHarvester.lib.core import Core
+from theHarvester.lib.core import *
 from theHarvester.parsers import myparser
-import requests
 
 
 class SearchVirustotal:
@@ -12,18 +11,17 @@ def __init__(self, word):
         self.quantity = '100'
         self.counter = 0
 
-    def do_search(self):
+    async def do_search(self):
         base_url = f'https://www.virustotal.com/ui/domains/{self.word}/subdomains?relationships=resolutions&cursor=STMwCi4%3D&limit=40'
         headers = {'User-Agent': Core.get_user_agent()}
-        res = requests.get(base_url, headers=headers)
-        self.results = res.content.decode('UTF-8')
+        responses = await async_fetcher.fetch_all([base_url], headers=headers)
+        self.results = responses[0]
         self.totalresults += self.results
 
-    def get_hostnames(self):
+    async def get_hostnames(self):
         rawres = myparser.Parser(self.results, self.word)
         return rawres.hostnames()
 
-    def process(self):
+    async def process(self):
         print('\tSearching results.')
-        self.do_search()
-        self.get_hostnames()
+        await self.do_search()
diff --git a/theHarvester/discovery/yahoosearch.py b/theHarvester/discovery/yahoosearch.py
index 4fc324a4..c3387332 100644
--- a/theHarvester/discovery/yahoosearch.py
+++ b/theHarvester/discovery/yahoosearch.py
@@ -11,22 +11,21 @@ def __init__(self, word, limit):
         self.server = 'search.yahoo.com'
         self.limit = limit
 
-    def do_search(self):
+    async def do_search(self):
         base_url = f'https://{self.server}/search?p=%40{self.word}&b=xx&pz=10'
         headers = {
             'Host': self.server,
             'User-agent': Core.get_user_agent()
         }
         urls = [base_url.replace("xx", str(num)) for num in range(0, self.limit, 10) if num <= self.limit]
-        request = (grequests.get(url, headers=headers) for url in urls)
-        response = grequests.imap(request, size=5)
-        for entry in response:
-            self.total_results += entry.content.decode('UTF-8')
+        responses = await async_fetcher.fetch_all(urls, headers=headers)
+        for response in responses:
+            self.total_results += response
 
-    def process(self):
-        self.do_search()
+    async def process(self):
+        await self.do_search()
 
-    def get_emails(self):
+    async def get_emails(self):
         rawres = myparser.Parser(self.total_results, self.word)
         toparse_emails = rawres.emails()
         emails = set()
@@ -39,6 +38,6 @@ def get_emails(self):
             emails.add(email)
         return list(emails)
 
-    def get_hostnames(self):
+    async def get_hostnames(self):
         rawres = myparser.Parser(self.total_results, self.word)
         return rawres.hostnames()