diff --git a/docs/features.md b/docs/features.md
index c790b1348..2214cc941 100644
--- a/docs/features.md
+++ b/docs/features.md
@@ -249,7 +249,7 @@ And you can add other SSL feeds in ```ssl_feeds``` in ```config/slips.conf```.
 
 ### Young Domains
 
-Slips uses whois python library to get the creation date of every domain met in the dns flows.
+Slips uses python-whois-extended==0.7.12 library to get the creation date of every domain met in the dns flows.
 
 If a domain's age is less than 60 days, slips sets an alert.
 
diff --git a/requirements.txt b/requirements.txt
index 11e74a010..05a0633d9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ blinker
 exclusiveprocess
 setuptools
 pytest-dependency
-whois
+python-whois-extended==0.7.12
 wheel
 flask
 tld