diff --git a/removed_sites.json b/removed_sites.json
index 8140d94..9c7db17 100644
--- a/removed_sites.json
+++ b/removed_sites.json
@@ -363,15 +363,6 @@
     "username_claimed": "blue",
     "username_unclaimed": "noonewouldeverusethis7"
   },
-  "500px": {
-    "errorMsg": "Oops! This page doesn\u2019t exist.",
-    "errorType": "message",
-    "regexCheck": "^[a-z0-9_]+$",
-    "url": "https://500px.com/{}",
-    "urlMain": "https://500px.com/",
-    "username_claimed": "blue",
-    "username_unclaimed": "noonewouldeverusethis7"
-  },
   "PayPal": {
     "errorMsg": "<meta name=\"twitter:title\" content=\"Get your very own PayPal.Me link\" />",
     "errorType": "message",
diff --git a/removed_sites.md b/removed_sites.md
index fdb2762..f4afa4b 100644
--- a/removed_sites.md
+++ b/removed_sites.md
@@ -729,22 +729,6 @@ As of 2020-08-11, YandexCollection presents us with a rechapta which prevents us
   },
 ```
 
-## 500px
-
-As of 2020-08-24, 500px now returns false positives, which was found when running the tests, but will most likley be added again in the near
-future once we find a better error detecting method.
-```
-  "500px": {
-    "errorMsg": "Oops! This page doesn\u2019t exist.",
-    "errorType": "message",
-    "regexCheck": "^[a-z0-9_]+$",
-    "url": "https://500px.com/{}",
-    "urlMain": "https://500px.com/",
-    "username_claimed": "blue",
-    "username_unclaimed": "noonewouldeverusethis7"
-  },
-```
-
 ## PayPal
 
 As of 2020-08-24, PayPal now returns false positives, which was found when running the tests, but will most likley be added again in the near
diff --git a/sherlock/tests/all.py b/sherlock/tests/all.py
index 90892b7..b7b7f91 100644
--- a/sherlock/tests/all.py
+++ b/sherlock/tests/all.py
@@ -21,7 +21,7 @@ class SherlockDetectTests(SherlockBaseTest):
         Will trigger an assert if detection mechanism did not work as expected.
         """
 
-        site = 'Instructables'
+        site = 'BinarySearch'
         site_data = self.site_data_all[site]
 
         #Ensure that the site's detection method has not changed.
@@ -48,7 +48,7 @@ class SherlockDetectTests(SherlockBaseTest):
         Will trigger an assert if detection mechanism did not work as expected.
         """
 
-        site = 'Instructables'
+        site = 'BinarySearch'
         site_data = self.site_data_all[site]
 
         #Ensure that the site's detection method has not changed.
@@ -129,7 +129,7 @@ class SherlockDetectTests(SherlockBaseTest):
         Will trigger an assert if detection mechanism did not work as expected.
         """
 
-        site = 'Quora'
+        site = 'VK'
         site_data = self.site_data_all[site]
 
         #Ensure that the site's detection method has not changed.
@@ -156,7 +156,7 @@ class SherlockDetectTests(SherlockBaseTest):
         Will trigger an assert if detection mechanism did not work as expected.
         """
 
-        site = 'Quora'
+        site = 'VK'
         site_data = self.site_data_all[site]
 
         #Ensure that the site's detection method has not changed.
diff --git a/sites.md b/sites.md
index fe941fe..ac7d4b1 100644
--- a/sites.md
+++ b/sites.md
@@ -301,4 +301,4 @@
 300. [toster](https://www.toster.ru/)
 301. [uid](https://uid.me/)
 302. [Atom Discussions](https://discuss.atom.io)
-303. [Quizlet](https://quizlet.com)
+303. [Quizlet](https://quizlet.com)
\ No newline at end of file