diff --git a/README.md b/README.md
index d93e2ba..d24deae 100644
--- a/README.md
+++ b/README.md
@@ -9,12 +9,10 @@ using [Certbot](https://certbot.eff.org/) DNS-01 challenge validation for domain
 
 ## Setup
 
-The scripts use the [untangle](https://untangle.readthedocs.io/en/latest/) and tldextract libraries, if not already installed on your system:
+The scripts use the [tldextract](https://github.com/john-kurkowski/tldextract) and [untangle](https://untangle.readthedocs.io/en/latest/) libraries, if not already installed on your system:
 
 ```
-pip install untangle
-
-pip install tldextract
+pip install tldextract untangle
 ```
 
 Download the [latest release](https://github.com/ethauvin/namesilo-letsencrypt/releases) archive and expand it in the desired directory.
@@ -46,4 +44,3 @@ certbot certonly --manual --email you@example.com \
 </pre>
 
 Please note that NameSilo DNS propagation takes up to **15 minutes**. The scripts will wait **20 minutes** before completing, just to be safe.
-q
diff --git a/authenticator.py b/authenticator.py
index 8098b0c..742ff9e 100755
--- a/authenticator.py
+++ b/authenticator.py
@@ -52,29 +52,28 @@ def sleep(minutes):
 
 domain = os.environ['CERTBOT_DOMAIN']
 validation = os.environ['CERTBOT_VALIDATION']
-tmpdir = os.path.join(tempfile.gettempdir(), "CERTBOT_"+domain)
+tmpdir = os.path.join(tempfile.gettempdir(), "CERTBOT_" + domain)
 rrhost = "_acme-challenge"
 
 if "NAMESILO_API" in os.environ:
     apikey = os.environ['NAMESILO_API']
 
-
 tld = tldextract.extract(domain)
-nsdomain = tld.domain+"."+tld.suffix
+nsdomain = tld.domain + "." + tld.suffix
 if tld.subdomain:
-    rrhost += "."+tld.subdomain
+    rrhost += "." + tld.subdomain
 
 url = "https://www.namesilo.com/api/dnsAddRecord?\
-version=1&type=xml&key="+apikey+"&domain="+nsdomain+"&rrtype=TXT\
-&rrhost="+rrhost+"&rrvalue="+validation+"&rrttl=3600"
+version=1&type=xml&key=" + apikey + "&domain=" + nsdomain + "&rrtype=TXT\
+&rrhost=" + rrhost + "&rrvalue=" + validation + "&rrttl=3600"
 
 req = urllib.request.Request(
     url,
     data=None,
     headers={
-        'User-Agent': ('Mozilla/5.0 (X11; CrOS x86_64 11647.154.0) '
+        'User-Agent': ('Mozilla/5.0 (Windows NT 10.0; Win64; x64) '
                        'AppleWebKit/537.36 (KHTML, like Gecko) '
-                       'Chrome/73.0.3683.114 Safari/537.36')
+                       'Chrome/80.0.3987.163 Safari/537.36')
     }
 )
 
diff --git a/cleanup.py b/cleanup.py
index e95a369..28a8e4a 100755
--- a/cleanup.py
+++ b/cleanup.py
@@ -42,17 +42,17 @@ import untangle
 from config import apikey
 
 domain = os.environ['CERTBOT_DOMAIN']
-tmpdir = os.path.join(tempfile.gettempdir(), "CERTBOT_"+domain)
-
+tmpdir = os.path.join(tempfile.gettempdir(), "CERTBOT_" + domain)
 
 if "NAMESILO_API" in os.environ:
     apikey = os.environ['NAMESILO_API']
 
 tld = tldextract.extract(domain)
-nsdomain = tld.domain+"."+tld.suffix
+nsdomain = tld.domain + "." + tld.suffix
 
 url = "https://www.namesilo.com/api/dnsDeleteRecord\
-?version=1&type=xml&key="+apikey+"&domain="+nsdomain+"&rrid="
+?version=1&type=xml&key=" + apikey + "&domain=" + nsdomain + "&rrid="
+
 
 def getrequest(record_id):
     return urllib.request.Request(